Crossword Genius

Bubbly‘s cold, getting cooler (7)

Ross

I believe the answer is:

chipper

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

'bubbly's' is the definition.
(thesaurus)

'cold getting cooler' is the wordplay.
I cannot quite understand how this works, but
'cold' could be 'c' (eg on taps) and 'c' is present in the answer.
The remaining letters 'hipper' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for chipper that I've seen before include "Happy" , "employee in fast-food joint" , "Debonair" , "person damaging crockery?" , "golfer, perhaps?" .)

I've seen this clue in The Sun.
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