Tea, a little 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 a little butter and one' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'a little butter' becomes 'pat' ('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 "Unleavened bread of the subcontinent" , "What Indian waiter might bring" , "Sort of bread" , "I may be taken in with Indian" , "Indian pancake" .)