Saucy sort of advance leads to absolutely torrid affair (7)
I believe the answer is:
passata
'saucy sort' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'advance leads to absolutely torrid affair' is the wordplay.
'advance' becomes 'pass' (passing is a kind of advancing).
'leads to' says to take the initial letters.
The initial letters of 'absolutely torrid affair' is 'ata'.
'pass'+'ata'='PASSATA'
'of' is the link.
Can you help me to learn more?
(Other definitions for passata that I've seen before include "Sieved tomato puree" , "Tomato sauce" .)