Claire makes a cake (6)
I believe the answer is:
eclair
'a cake' is the definition.
(I know that eclair is a type of cake)
'claire makes' is the wordplay.
'makes' is an anagram indicator.
'claire' is an anagram of 'ECLAIR'.
(Other definitions for eclair that I've seen before include "cream-cake" , "Long cream puff" , "Finger-shaped cake with cream and chocolate" , "Oblong cream puff" , "Sweet thing" .)