Chef had one oriental biscuit (6)

I believe the answer is:

'biscuit' is the definition.
('cookie' can be a synonym of 'biscuit')

'chef had one oriental' is the wordplay.
'chef' becomes 'cook' (I've seen this before).
'had' means one lot of letters go next to another.
'one' becomes 'i' (Roman numeral).
'oriental' becomes 'e'.
'cook'+'i'+'e'='COOKIE'

(Other definitions for cookie that I've seen before include "US biscuit, Scottish bun" , "Computer tracker; US biscuit" , "Data packet; biscuit" , "Small sweet biscuit or cake in the US" , "An American sweet biscuit" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app