Dish bound to be rejected with clam inside (6)
I believe the answer is:
paella
'dish' is the definition.
(paella is a kind of dish)
'bound to be rejected with clam inside' is the wordplay.
'bound' becomes 'leap' ('leap' can be a synonym of 'bound'**).
'to be rejected' shows that the letters should be reversed in order.
'with' means one lot of letters go next to another.
'inside' says to take the centre.
The central letters of 'clam' are 'la'.
'leap' reversed gives 'pael'.
'pael'+'la'='PAELLA'
(Other definitions for paella that I've seen before include "Dish made of rice, shellfish and chicken" , "something to eat" , "Dish (not English)" , "Span. rice dish" , "Spanish dish based on saffron rice" .)