Crossword Genius

Knock bust over (4)

Ross

I believe the answer is:

stub

'knock' is the definition.

'bust over' is the wordplay.
'over' indicates an anagram.
'bust' is an anagram of 'STUB'.

(Other definitions for stub that I've seen before include "Pencil/cigarette remnant" , "Strike against hard object - one's toe, perhaps" , "what smoker drops in street?" , "Residue of cigarette or cheque" , "Broken-off end" .)

I've seen this clue in The Daily Express and The Mirror.
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