Time short after worker has a fit (7)
I believe the answer is:
Here is my best explanation:
'a fit' is the definition.
('tantrum' can be a synonym of 'fit')
'time short after worker' is the subsidiary indication.
'time' becomes 't'.
'short' becomes 'rum' (short can mean an alcoholic drink**).
'after' is a charade indicator (letters next to each other).
'worker' becomes 'ant'.
'rum' after 'ant' is 'antrum'.
'has' is the link.
(Other definitions for tantrum that I've seen before include "Childish angry outburst", "Wobbly", "Spoilt brat's fit", "throwing this?", "childish fit of rage", "Pet, temper", "Fit of ill-temper", "Fit - pet", "Paddy" and "Child's outburst of bad temper".)