Crossword Genius

Petition concerning expedition? (7)

Ross

I believe the answer is:

request

'petition' is the definition.
(I know that petition is a more specific form of the action request)

'concerning expedition?' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'expedition?' becomes 'quest' (I've seen this in other clues).
're'+'quest'='REQUEST'

(Other definitions for request that I've seen before include "Queer St (anag.)" , "Application" , "Suit" , "Plea" , "Call for" .)

I've seen this clue in The Times.
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