Drunk, extremely insulting with worker, person in suit (8)
I believe the answer is:
litigant
'person in suit' is the definition.
'litigant' can be an answer for 'person' (litigant is a kind of person). I am not sure about the 'in suit' bit.
'drunk extremely insulting with worker' is the wordplay.
'drunk' becomes 'lit' (I've seen this in other clues**).
'extremely' suggests removing the centre.
'with' means one lot of letters go next to another.
'worker' becomes 'ant' (worker is a type of ant).
'insulting' with its centre taken out is 'ig'.
'lit'+'ig'+'ant'='LITIGANT'
Can you help me to learn more?
(Other definitions for litigant that I've seen before include "Instigator of a courtly battle" , "Person involved in a lawsuit" , "Man in suit" , "One going to law" , "One conducting a law suit" .)