Prime ministers given a flatbread (5)
I believe the answer is:
pitta
'flatbread' is the definition.
(I've seen this before)
'prime ministers given a' is the wordplay.
'prime ministers' becomes 'Pitt' (Pitt the Elder and Pitt the Younger).
'given' says to put letters next to each other.
'pitt'+'a'='PITTA'
(Other definitions for pitta that I've seen before include "Flat bread that's split to take a filling" , "Type of flat bread that's split to hold a filling" , "Flat sort of bread" , "(E.g. Greek) bread" , "Greek unleavened bread" .)