Firm uniting man and social worker (7)
I believe the answer is:
adamant
'firm uniting' is the definition.
'adamant' can be an answer for 'firm' (adamant can mean firm or determined). I'm unsure of the 'uniting' bit.
'man and social worker' is the wordplay.
'man' becomes 'adam' (man's name).
'and' means one lot of letters go next to another.
'social worker' becomes 'ant' (ants are social insects).
'adam'+'ant'='ADAMANT'
Can you help me to learn more?
(Other definitions for adamant that I've seen before include "Inexorable" , "Unyielding to requests, stubborn" , "Data man can be quite unyielding" , "Resolute; diamond (arch.)" , "Definite and unyielding" .)