Social worker is behind those in opposition (5)
I believe the answer is:
antis
'opposition' is the definition.
(I've seen this in another clue)
'social worker is behind' is the wordplay.
'social worker' becomes 'ant' (ants are social insects).
'behind' says to put letters next to each other.
'ant'+'is'='ANTIS'
'those in' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for antis that I've seen before include "Opponents" , "They say no" , "They're opposed to" , "the group voting no" , "People who are opposed" .)