Busy worker recoils at first drink (4)
I believe the answer is:
beer
'drink' is the definition.
(I know that beer is a drink)
'busy worker recoils at first' is the wordplay.
'busy worker' becomes 'bee' (I've seen this in another clue).
'at first' says to take the initial letters.
The initial letter of 'recoils' is 'r'.
'bee'+'r'='BEER'
(Other definitions for beer that I've seen before include "Fermented alcoholic beverage" , "Hop drink" , "Fermented malt and hops" , "Malt liquor" , "pint" .)