Grant for one to conceal order error for canteen (10)
I believe the answer is:
commissary
'canteen' is the definition.
(commissary is a kind of canteen)
'grant for one to conceal order error' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'order' could be 'om' (order of merit) and 'om' is found within the answer.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Another definition for commissary that I've seen is " delegate".)