Crossword Genius

Knock a score back (3)

Ross

I believe the answer is:

rap

'knock' is the definition.
(I know that knock can be written as rap)

'a score back' is the wordplay.
'a score' becomes 'par' (par is a kind of score).
'back' shows that the letters should be reversed in order.
'par' back-to-front is 'RAP'.

(Other definitions for rap that I've seen before include "Hit - "songs" by Snoop Dogg and Jay-Z, say" , "Form of music with chanted rhyming lyrics" , "Knock, tap" , "Knock loudly" , "Form of music with spoken lyrics" .)

I've seen this clue in the Sydney Morning Herald.
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