Crossword Genius

Agree to attempt short back and sides for narcissist (6)

Ross

I believe the answer is:

assent

'agree to' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for assent that I've seen before include "Permit or approve" , "Okay" , "Acquiescence" , "Accede, acquiesce" , "Agreement or concurrence" .)

I've seen this clue in The Independent.
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