Performer who has the stomach for it (5,6)
I believe the answer is:
belly dancer
'performer' is the definition.
(belly dancer is a kind of performer)
'the stomach for it' is the wordplay.
'the stomach' becomes 'belly' (synonyms).
'for it' becomes 'dancer' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'belly'+'dancer'='BELLY-DANCER'
'who has' is the link.
Can you help me to learn more?
(Other definitions for belly dancer that I've seen before include "Exotic Middle Eastern performer" , "Middle Eastern entertainer" , "manoeuvring needed for such?" , "Female performer" , "Performing gyrator of the tummy" .)