Shout right at worker (4)
I believe the answer is:
rant
'shout' is the definition.
(I've seen this in other clues)
'right at worker' is the wordplay.
'right' becomes 'r' (common abbreviation).
'at' says to put letters next to each other.
'worker' becomes 'ant' (worker is a type of ant).
'r'+'ant'='RANT'
(Other definitions for rant that I've seen before include "Show anger" , "Talk wildly or violently" , "Angry tirade" , "End-of-course exams" , "Loud and emotional declamation" .)