Performing engineers' search, when asked (2,7)

I believe the answer is:

on request

'when asked' is the definition.
(I've seen this before)

'performing engineers' search' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'engineers'' becomes 'RE' (Royal Engineers).
'search' becomes 'quest' (quest is a kind of search).
'on'+'re'+'quest'='ON REQUEST'

(Another definition for on request that I've seen is " When asked for".)

I've seen this clue in The Daily Express.

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