Powerful blow found in Washington's Watergate (4)
I believe the answer is:
swat
'powerful blow' is the definition.
'swat' can be an answer for 'blow' (swat is a kind of blow). I'm not sure about the 'powerful' bit.
'in washington's watergate' is the wordplay.
'in' says the answer is hidden in the clue.
'SWAT' can be found hidden inside 'washingtons watergate'.
'found' is the link.
Can you help me to learn more?
(Other definitions for swat that I've seen before include "Hit (insect) sharply" , "Twas something of a blow" , ".`Twas quite a blow" , "Hit smartly" , "Swift, sharp blow" .)