Workers' organisation with means of raising flag (5,4)
I believe the answer is:
union jack
'flag' is the definition.
(I know that Union Jack is a type of flag)
'workers' organisation with means of raising' is the wordplay.
'workers' organisation' becomes 'union' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'means of raising' becomes 'jack' (I can't justify this - if you can you should give a lot more credence to this answer).
'union'+'jack'='UNION JACK'
Can you help me to learn more?
(Other definitions for union jack that I've seen before include "Colours" , "standard for us" , "National flag of United Kingdom" , "appears up the pole" , "UK's standard" .)