Page in Welsh converted for young English setters, say (6)
I believe the answer is:
whelps
'young english setters say' is the definition.
(English setter is a breed of dog)
'page in welsh converted' is the wordplay.
'page' becomes 'p'.
'in' indicates putting letters inside.
'converted' indicates an anagram.
'welsh' anagrammed gives 'whels'.
'p' going within 'whels' is 'WHELPS'.
'for' is the link.
(Other definitions for whelps that I've seen before include "puppies" , "Gives birth" , "Young wolves or dogs" , "Young dogs or pups" , "Young of various canines" .)