Catch husband, say, scratching head and reversing (6)
I believe the answer is:
entrap
'catch' is the definition.
(entrapping is a kind of catching)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for entrap that I've seen before include "Snare, trick" , "Catch like parent" , "Trick or beguile for parent" , "Snare - inveigle" , "Ensnare, catch" .)