Catch with an outright blow (4)
I believe the answer is:
trap
'catch' is the definition.
(I know that trap is a kind of catch)
'with an outright blow' is the wordplay.
'with' is a charade indicator (letters next to each other).
'an outright' becomes 't' (I can't justify this - if you can you should give a lot more credence to this answer).
'blow' becomes 'rap' (rap is a kind of blow).
't' next to 'rap' is 'TRAP'.
Can you help me to learn more?
(Other definitions for trap that I've seen before include "Means of transport (sometime sprung!)" , "Deceive" , "Control ball" , "Snaring device" , "Driver's obstacle" .)