Galileo's hometown (4)
I believe the answer is:
pisa
'galileo's hometown' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pisa that I've seen before include "Tuscan city" , "Italian city with leaning tower" , "Italian city with famous tower" , "City in Tuscany" , "Location of leaning tower" .)