Time short after worker has a fit (7)
I believe the answer is:
tantrum
'a fit' is the definition.
('tantrum' can be a synonym of 'fit')
'time short after worker' is the wordplay.
'time' becomes 't'.
'short' becomes 'rum' (short can mean an alcoholic drink**).
'after' means one lot of letters go next to another.
'worker' becomes 'ant' (worker is a type of ant).
'rum' after 'ant' is 'antrum'.
't'+'antrum'='TANTRUM'
'has' is the link.
(Other definitions for tantrum that I've seen before include "Childish display of temper" , "Burst of temper" , "Childish outbreak of temper" , "Child's outburst of bad temper" , "petulant outburst" .)