Spice is brought back and included in biryani, much to their satisfaction (5)
I believe the answer is:
cumin
'spice' is the definition.
(cumin is a spice)
'brought back and included in biryani much to their satisfaction' is the wordplay.
'CUMIN' is hidden back-to-front in amongst the letters.
However, I'm not sure how the hidden word is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for cumin that I've seen before include "Spice seeds" , "seasoning" , "Aromatic seeds used in cooking" , "Mediterranean plant with aromatic seeds" , "Aromatic (curry) spice" .)