Crossword Genius

Acting curiously while performing the song in (6)

Ross

I believe the answer is:

nosing

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'acting curiously while' is the definition.
I can't tell whether this definition defines the answer.

'performing the song in' is the wordplay.
'performing' is an anagram indicator.
'song'+'in'='songin'
'songin' with letters rearranged gives 'NOSING'.

Can you help me to learn more?

(Other definitions for nosing that I've seen before include "Moving slowly" , "snooping" , "Moulding edge; prying" , "like bloodhound on trail" , "going, gradually" .)

I've seen this clue in the Evening Standard.
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