Crossword Genius

Chill in castle with novel (4,5)

Ross

I believe the answer is:

keep fresh

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

'chill' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'castle with novel' is the wordplay.
I cannot really understand how this works, but
'castle' could be 'keep' (I've seen this in other clues) and 'keep' is found in the answer.
'novel' could be 'fresh' (both can mean new) and 'fresh' is present in the answer.
No letters remain.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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