Increase radio audience - sounds like they stick! (8)

I believe the answer is:

adherers

I'm a little stuck... Click here to teach me more about this clue!

'increase radio audience sounds like they' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'stick' is the wordplay.
I cannot quite understand how this works, but
'stick' could be 'adhere' (to adhere to something is to stick to it) and 'adhere' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.

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