Almost everyone, hot, getting stuck into chilled drink (7)
I believe the answer is:
alcohol
'drink' is the definition.
(synonyms)
'almost everyone hot getting stuck into chilled' is the wordplay.
'almost' means to remove the last letter (almost the whole word is kept).
'everyone' becomes 'all' (all people).
'hot' becomes 'h' (abbreviation, eg on taps).
'getting stuck into' is an insertion indicator.
'chilled' becomes 'cool' (similar in meaning).
'all' with its final letter removed is 'al'.
'h' inserted into 'cool' is 'cohol'.
'al'+'cohol'='ALCOHOL'
(Other definitions for alcohol that I've seen before include "Intoxicant in wine, etc." , "Intoxicating liquid" , "It can make one merry" , "I could get you pickled" , "Intoxicating element of liquor" .)