They don’t like people getting on stage performing with mics oddly off (7)

'they don't like people getting' is the definition.
The definition suggests an adverb but the answer is not.

'stage performing with mics oddly off' is the wordplay.
'performing with' indicates anagramming the letters (the letters move around or 'perform').
'oddly off' indicates alternate letters (letters in odd-numbered positions removed).
The alternate letters of 'mics' are 'is'.
'stage' with its letters anagrammed with 'is' gives 'AGEISTS'.

'on' is the link.

Can you help me to learn more?