Fit drink after time with worker (7)
I believe the answer is:
tantrum
'fit' is the definition.
('tantrum' can be a synonym of 'fit')
'drink after time with worker' is the wordplay.
'drink' becomes 'rum' (I've seen this before**).
'after' says to put letters next to each other.
'time' becomes 't'.
'with' is a charade indicator (letters next to each other).
'worker' becomes 'ant' (worker is a type of ant).
't'+'ant'='tant'
'rum' put after 'tant' is 'TANTRUM'.
(Other definitions for tantrum that I've seen before include "Childish display of temper" , "fit of bad temper" , "Pet, temper" , "Fit of childish temper" , "Uncontrolled outburst of anger" .)