Catching a few fish would be the answer (5)
I believe the answer is:
solve
'the answer' is the definition.
(thesaurus)
'catching a few fish' is the wordplay.
'catching' is an insertion indicator.
'a few' becomes 'v'.
'fish' becomes 'sole' (sole is a kind of fish).
'v' inserted inside 'sole' is 'SOLVE'.
'would be' acts as a link.
(Other definitions for solve that I've seen before include "Get the answers" , "Deal with (a problem)" , "Crack clues" , "Voles (anag.)" , "Unscramble" .)