Some material celebrity brought up to make pastry (6)
I believe the answer is:
eclair
'pastry' is the definition.
(eclair is a kind of pastry)
'some material celebrity brought up' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'brought up' says the letters should be written backwards (in a down clue, letters go up).
'rialce' can be found hidden inside 'material celebrity'.
'rialce' backwards is 'ECLAIR'.
'to make' is the link.
(Other definitions for eclair that I've seen before include "Long chocolate cake for Claire" , "something at teatime?" , "Soft cream cake" , "Comedienne" , "Finger-shaped cream-filled cake of choux pastry" .)