Cake made by Claire (6)
I believe the answer is:
eclair
'cake' is the definition.
(I've seen this before)
'made by claire' is the wordplay.
'made by' indicates anagramming the letters (another word made by the same letters).
'claire' anagrammed gives 'ECLAIR'.
(Other definitions for eclair that I've seen before include "Cake, "long in shape but short in duration"" , "Long thin cake with chocolate and cream" , "Type of cream cake" , "Long chocolate cake for Claire" , "cream-cake" .)