Row after catching grand, wild cat (5)
I believe the answer is:
tiger
'wild cat' is the definition.
(I've seen this before)
'row after catching grand' is the wordplay.
'row' becomes 'tier' (tier is a kind of row).
'after catching' means one lot of letters goes inside another.
'grand' becomes 'g' (synonyms).
'tier' enclosing 'g' is 'TIGER'.
(Other definitions for tiger that I've seen before include "Formidable opponent" , "fierce animal" , "Fierce person" , "Wildcat of Bengal" , "- - Woods (golf)" .)