Might one scoff at this during pillow talk? (9,2,3)

'might one' is the definition.
The definition suggests an adjective which matches the answer.

'scoff at this during pillow talk?' is the wordplay.
I cannot really understand how this works, but
'at' could be 'in' (synonymous in some cases - eg at school, in school) and 'in' is found in the answer.
'pillow' could be 'bed' (bed pillow is a kind of pillow) and 'bed' is present in the answer.
'talk?' could be 'break' (talking is a kind of breaking) and 'break' is present in the answer.
The remaining letters 'fast' is a valid word 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?