Set off to fish with the dogs (7)
I believe the answer is:
bassets
'the dogs' is the definition.
(basset is a kind of dog)
'set off to fish' is the wordplay.
'off' indicates anagramming the letters.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'fish' becomes 'bass' (bass is a kind of fish**).
'set' with letters rearranged gives 'ets'.
'ets' after 'bass' is 'BASSETS'.
'with' acts as a link.
(Other definitions for bassets that I've seen before include "Dogs" , "Hounds with short legs and long ears" .)