Crossword Genius

Prison more stylish? (6)

Ross

I believe the answer is:

cooler

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

'prison' is the definition.
(informal term for a prison)

'more stylish?' is the wordplay.
I cannot really see how this works, but
'stylish?' could be 'cool' and 'cool' is found within the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for cooler that I've seen before include "less enthusiastic" , "Fan" , "more sophisticated" , "Nick" , "It's not so hot" .)

I've seen this clue in The Times.
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