Crossword Genius

Those who avail themselves of services rendered (11)

Ross

I believe the answer is:

churchgoers

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'those who avail themselves' is the definition.
The definition suggests an adverb but the answer is not.

'services rendered' is the wordplay.
'services' becomes 'church services' (church service is a kind of service).
'rendered' becomes 'goers' (I can't explain this - if you can you should give a lot more credence to this answer).
'church'+'goers'='CHURCHGOERS'

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.
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