Biscuit that may be placed on computer (6)
I believe the answer is:
cookie
I believe this is a double definition.
'biscuit' is the first definition.
(synonyms)
'that may be placed on computer' is the second definition.
(piece of data stored by a web browser)
(Other definitions for cookie that I've seen before include "Piece of computer data" , "Small sweet biscuit or cake in the US" , "An American sweet biscuit" , "Biscuit; computer data" , "that sits on computer" .)