Put an end to strong drink (6)
I believe the answer is:
scotch
This clue is a double definition.
'put an end' is the first definition.
(I've seen this before)
'strong drink' is the second definition.
(Scotch is an example)
'to' is the link.
(Other definitions for scotch that I've seen before include "Put an end to, say rumour" , "providing nursery facility in school" , "Put an end to - drink" , "hard drink" , "Put an end to - in Glasgow? (6)" .)