Start cooking cakes (5)
I believe the answer is:
tarts
'cakes' is the definition.
(I've seen this before)
'start cooking' is the wordplay.
'cooking' indicates anagramming the letters (cook can mean to falsify or distort).
'start' is an anagram of 'TARTS'.
(Other definitions for tarts that I've seen before include "Broads" , "Hookers" , "Small open pies" , "Flans" , "cooked food" .)