Rich pastry (6)
I believe the answer is:
eclair
'rich pastry' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eclair that I've seen before include "teatime treat?" , "Comedienne" , "Soft cream cake" , "A relic (anag)" , "Chocolate-topped, cream-filled cake" .)