Runs in to catch crow (4)
I believe the answer is:
brag
'crow' is the definition.
(I know that crow can be written as brag)
'runs in to catch' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'in' is an insertion indicator.
'to catch' becomes 'bag' (synonyms).
'r' inserted inside 'bag' is 'BRAG'.
(Other definitions for brag that I've seen before include "Boast about garb" , "Talk boastfully" , "Card game, like poker" , "Shoot a line" , "boast; form of poker" .)