Agents in a groovy environment up there, find musician (8)

I believe the answer is:

organist

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

'musician' is the definition.
(I know that organist is a type of musician)

'agents in a groovy environment up there' is the wordplay.
'ORGANIST' is hidden back-to-front within the letters.
But, I am uncertain how this is indicated.

'find' acts as a link.

Can you help me to learn more?

(Other definitions for organist that I've seen before include "Accompanist, keyboard player" , "It groans for church musician" , "Church instr. player" , "Cathedral musician" , "Roasting (anag)" .)

I've seen this clue in The Irish Times.

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