Feline companion producing snag (5)
I believe the answer is:
catch
'snag' is the definition.
(thesaurus)
'feline companion' is the wordplay.
'feline' becomes 'cat' (I've seen this before).
'companion' becomes 'ch' (I've seen this in other clues).
'cat'+'ch'='CATCH'
'producing' acts as a link.
(Other definitions for catch that I've seen before include "Desirable husband; unforeseen problem" , "Fastener on door or window" , "Snare, entrap" , "problem in small print?" , "potential partner?" .)