They work at their last cold drinks (8)
I believe the answer is:
cobblers
'drinks' is the definition.
(cobbler is a kind of drink)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for cobblers that I've seen before include "More than one at last" , "They make and mend shoes" , "Shoe repairers" , "drinks > moonshine" , "Rubbish - shoe menders" .)