Crossword Genius

Performing team not anticipating referee's whistle? (6)

Ross

I believe the answer is:

onside

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'not anticipating referee's whistle?' is the definition.
I can't tell whether this definition defines the answer.

'performing team' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'team' becomes 'side' (both can mean a sports team).
'on'+'side'='ONSIDE'

Can you help me to learn more?

(Other definitions for onside that I've seen before include "In a legal position (football)" , "in a position to score?" , "in a good position" , "Working towards the same goal" , "In position to play" .)

I've seen this clue in The Telegraph.
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