Left winger beginning to backtrack, as requested (2,5)

I believe the answer is:
to order
'as requested' is the definition.
(as in items made to order)
'left winger beginning to backtrack' is the wordplay.
I cannot really understand how this works, but
'winger' could be 'oo' and 'oo' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for to order that I've seen before include "In fulfilment of an instruction" , "as required" , "In accordance with specification" , "As specified" .)
