Get used to another union backing demos (5)
I believe the answer is:
inure
'get used to' is the definition.
(I've seen this in another clue)
'another union backing demos' is the wordplay.
'INURE' is hidden backwards in amongst the letters.
But, I'm uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for inure that I've seen before include "get tougher" , "Steel" , "Harden, make accustomed to" , "To give experience" , "Temper, toughen" .)