A man at one with Indian food (7)
I believe the answer is:
chapati
'indian food' is the definition.
(I've seen this before)
'a man at one' is the wordplay.
'a man' becomes 'chap' (I've seen this in other clues).
'one' becomes 'I' (Roman numeral).
'chap'+'at'+'i'='CHAPATI'
'with' is the link.
(Other definitions for chapati that I've seen before include "Unleavened bread of the subcontinent" , "Indian pancake" , "Sort of bread" , "Indian food" , "Unleavened bread of India" .)