Biscuit, a blue one behind green, initially (9)
I believe the answer is:
garibaldi
'biscuit' is the definition.
(I've seen this before)
'a blue one behind green initially' is the wordplay.
I cannot quite see how this works, but
'a' is within the answer.
'blue' could be 'ribald' (synonyms) and 'ribald' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
A single letter 'g' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for garibaldi that I've seen before include "blouse, loose one" , "girl's blouse!" , "leader of nationalists" , "Italian hero, who led his 'Thousand Redshirts' against the Austrians, d. 1882" , "Italian nationalist; biscuit" .)