Unrestrained racket by a social worker (7)
I believe the answer is:
rampant
'unrestrained' is the definition.
(I've seen this before)
'racket by a social worker' is the wordplay.
'racket' becomes 'ramp' (I've seen this in other clues).
'by' says to put letters next to each other.
'a social worker' becomes 'ant' (ants are social insects).
'ramp'+'ant'='RAMPANT'
(Other definitions for rampant that I've seen before include "On the rampage" , "Unbridled" , "Unrestrained, as animal may be in heraldry" , "Unchecked (and violent?)" , "Uncontrolled" .)