Possible to create a listbox by click on a button

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As far as I understand your question, I have tried this

from tkinter import *

root = Tk()

def saveClear():
    global entry_list
    listbox = Listbox(root)
    for entry in entry_list:
        listbox.insert(END, entry.get())
        entry.set('')
    listbox.pack(padx = 10, pady = 10)
    
entry_list = []
for _ in range(5):
    ent_var = StringVar()
    ent = Entry(root, textvariable = ent_var)
    entry_list.append(ent_var)
    ent.pack(padx = 10, pady = 10)

but = Button(root, text = 'Save and Clear', command = saveClear)
but.pack(padx = 10, pady = 10)

root.mainloop()

UPDATE: In order to get the values form a ListBox(), you will need to make use of listvariable attribute with the target as Variable() to store the values as a tuple and use the .get() method to get the value of the same.

Here is the updated code:

from tkinter import *

root = Tk()

def retrieve(index):    
    global values
    if index == 'all':
        for value in values:
            print(value.get())
    else:
        print(values[index].get())

values = []
def saveClear():
    global entry_list, values
    list_var = Variable()
    listbox = Listbox(root, listvariable = list_var)
    for entry in entry_list:
        listbox.insert(END, entry.get())
        entry.set('')
    values.append(list_var)
    listbox.pack(padx = 10, pady = 10)

entry_list = []
for _ in range(5):
    ent_var = StringVar()
    ent = Entry(root, textvariable = ent_var)
    entry_list.append(ent_var)
    ent.pack(padx = 10, pady = 10)

but = Button(root, text = 'Save and Clear', command = saveClear)
but.pack(padx = 10, pady = 10)

root.mainloop()
retrieve('all') #OR specify the index that you wish to retrieve

Here the retrieve() is called after the end of mainloop(), i.e., it will be executed after the termination of the mainloop, but you can use this function in your code as you require.

Hope it helped. Cheers!