A bitter blow if you're expecting a hot meal! (4,6)

I think it could be either:

Which length description are you looking for?:

4,6

10*

cold buffet

I'm a little stuck... Click here to teach me more about this clue!

'you're expecting a hot meal' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'a bitter blow' is the wordplay.
I cannot quite see how this works, but
'bitter' could be 'cold' (similar in meaning) and 'cold' is found in the answer.
'blow' could be 'buff' (I've seen this before) and 'buff' is located in the answer.
This explanation may well be incorrect...

'if' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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