Trap wasp - oddly, rotating fly-killer could do this (4)
I believe the answer is:
swat
'fly-killer could do this' is the definition.
The definition suggests a singular noun which matches the answer.
'trap wasp oddly rotating' is the wordplay.
'oddly' indicates alternate letters.
'rotating' says the letters should be written backwards.
'trap'+'wasp'='trapwasp'
The alternate letters of 'trapwasp' are 'taws'.
'taws' back-to-front is 'SWAT'.
Can you help me to learn more?
(Other definitions for swat that I've seen before include "'Twas quite a smack" , "Hit a wasp or fly" , "Hit smartly" , "Kill (fly)" , "Smack (a fly?)" .)