Caught partner getting fat (6)
I believe the answer is:
chubby
'fat' is the definition.
(I've seen this before)
'caught partner' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'partner' becomes 'hubby' (hubby is a kind of partner).
'c'+'hubby'='CHUBBY'
'getting' is the link.
(Other definitions for chubby that I've seen before include "Roundly plump" , "with too much fat" , "roly-poly" , "Slightly fat" , "Portly" .)