Crossword Genius

Shock performance by monkey (6)

Ross

I believe the answer is:

impact

'shock' is the definition.
(thesaurus)

'performance by monkey' is the wordplay.
'performance' becomes 'act' (act is a kind of performance).
'by' is a charade indicator (letters next to each other).
'monkey' becomes 'imp' ('imp' can be a synonym of 'monkey').
'act' put after 'imp' is 'IMPACT'.

(Other definitions for impact that I've seen before include "Bear upon" , "Forcible contact; marked influence" , "Serious effect" , "Impression" , "Collision - effect" .)

I've seen this clue in The Independent.
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