Do a job in the city on merger with group of workers
I believe the answer is:
trade union
'do a job in the city' is the definition.
I can't judge whether this defines the answer.
'merger with group of workers' is the wordplay.
'merger' becomes 'union' (I've seen this before).
'with' says to put letters next to each other.
'group of workers' becomes 'trade' (I can't justify this - if you can you should believe this answer much more).
'union' put after 'trade' is 'TRADE-UNION'.
'on' is the link.
Can you help me to learn more?
(Other definitions for trade union that I've seen before include "Equity perhaps" , "Equity is one such" , "Organised Labour" .)