One, for example, stops between? (7)
I believe the answer is:
integer
'one' is the definition.
(one is an integer)
'example stops between?' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'stops' means one lot of letters goes inside another (stopping can mean blocking a gap).
'between?' becomes 'inter'.
'eg' put into 'inter' is 'INTEGER'.
'for' acts as a link.
(Other definitions for integer that I've seen before include "One for example" , "Get Erin (anag)" , "A whole number, not a fraction" , "The whole thing" , "Result of counting" .)