Bishop up for sex and crack takes the biscuit! (6,4)
I believe the answer is:
brandy snap
'the biscuit' is the definition.
(I've seen this before)
'bishop up for sex and crack' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'up for sex' becomes 'randy' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'crack' becomes 'snap' (synonyms).
'b'+'randy'+'snap'='BRANDY-SNAP'
'takes' acts as a link.
Can you help me to learn more?
(Other definitions for brandy snap that I've seen before include "Crisp ginger biscuit" , "Crisp confection" , "Crisp, rolled biscuit" , "Cookie" , "sweet thing" .)