Performing with mastery when instructed (2,7)

I believe the answer is:

on command

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'instructed' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'performing with mastery' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'with' says to put letters next to each other.
'mastery' becomes 'command' (synonyms).
'on'+'command'='ON COMMAND'

'when' acts as a link.

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I've seen this clue in The Daily Express.

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