Thin biscuit a few baked with recipe (5)
I believe the answer is:
wafer
'thin biscuit' is the definition.
(I've seen this before)
'a few baked with recipe' is the wordplay.
'baked with' is an anagram indicator.
'recipe' becomes 'r' (abbreviation).
'a'+'few'='afew'
'afew' with its letters anagrammed with 'r' gives 'WAFER'.
(Other definitions for wafer that I've seen before include "Ice-cream biscuit" , "Communion bread" , "thin stuff" , "Very thin 14 Down" , "Very thin slice" .)