Arranging recorder in Gershwin piece (8)
I believe the answer is:
ordering
'arranging' is the definition.
('order' can be a synonym of 'arrange')
'recorder in gershwin piece' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'ORDERING' can be found hidden inside 'recorder in gershwin'.
(Other definitions for ordering that I've seen before include "Giving an instruction" , "Requesting (something) to be supplied" , "Commanding" , "Issuing commands" , "procurement" .)