At first every sip keeps you cooler (4)

I believe the answer is:

esky

'cooler' is the definition.
(I've seen this before)

'at first every sip keeps you' is the wordplay.
'at first' indicates taking the first letters.
The initial letters of 'every sip keeps you' is 'ESKY'.

(Other definitions for esky that I've seen before include "Cooler" , "Aussie container" , "Portable drinks chiller (Australian)" , "It may help to keep cool" .)

I've seen this clue in the Sydney Morning Herald.

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