As support, you’re not happy getting yours! (6)
I believe the answer is:
backup
'as support you're not' is the definition.
I can't judge whether this defines the answer.
'happy getting yours' is the wordplay.
'happy' becomes 'up' (I've seen this in other clues).
'getting' says to put letters next to each other.
'yours' becomes 'back' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'up' put after 'back' is 'BACKUP'.
Can you help me to learn more?
(Another definition for backup that I've seen is " Reserve".)