Crossword Genius

Sharpness wins fight -- heads are knocked off (7)

Ross

I believe the answer is:

insight

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'sharpness' is the definition.
(thesaurus)

'wins fight heads are knocked off' is the wordplay.
'wins' becomes 'ins' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'heads are knocked off' means to remove the first letter.
'fight' with its initial letter taken away is 'ight'.
'ins'+'ight'='INSIGHT'

Can you help me to learn more?

(Other definitions for insight that I've seen before include "what psychoanalysts hope to gain" , "Deep understanding" , "Sudden understanding" , "Clear understanding" , "Awareness" .)

I've seen this clue in The Telegraph.
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