This foreign bread is mine, thank you (5)
I believe the answer is:
pitta
'this foreign bread' is the definition.
'pitta' can be an answer for 'bread' (pitta is a type of bread). I'm not sure about the 'this foreign' bit.
'mine thank you' is the wordplay.
'mine' becomes 'pit' (down the pit).
'thank you' becomes 'ta' (informal way of saying thank you).
'pit'+'ta'='PITTA'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for pitta that I've seen before include "Type of flat bread that's split to hold a filling" , "Slightly leavened bread" , "Bread pocket" , "Flat sort of bread" , "I might have a kebab in" .)