Tea with some butter and one piece of bread (7)
I believe the answer is:
chapati
'piece of bread' is the definition.
(chapati is a type of bread)
'tea with some butter and one' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'with' means one lot of letters go next to another.
'some butter' becomes 'pat' (a pat can mean a lump of butter).
'and' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'cha'+'pat'+'i'='CHAPATI'
(Other definitions for chapati that I've seen before include "What Indian waiter might bring" , "I may be taken in with Indian" , "Indian food" , "Unleavened bread of India" , "Unleavened bread of the subcontinent" .)