Bring short strap back and wallop (4)
I believe the answer is:
swat
'wallop' is the definition.
(I've seen this in another clue)
'bring short strap back' is the wordplay.
'bring' becomes 'taw' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'short' suggests taking the first letters.
'back' is a reversal indicator.
The initial letter of 'strap' is 's'.
'taw'+'s'='taws'
'taws' back-to-front is 'SWAT'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for swat that I've seen before include "Deal a quick and effective blow (to)" , "'Hit swiftly, a fly perhaps (4)'" , "Strike sharply (at fly?)" , ".`Twas quite a blow" , "Hit smartly" .)