Rock band at first visits sports area with spies (7)

I believe the answer is:

breccia

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'rock' is the definition.
(I know that breccia is a type of rock)

'band at first visits sports area with spies' is the wordplay.
'at first' suggests taking the first letters.
'visits sports' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'area' becomes 'ec'.
'with' says to put letters next to each other.
'spies' becomes 'CIA' (Central Intelligence Agency).
The first letter of 'band' is 'b'.
'b'+'r'+'ec'+'cia'='BRECCIA'

Can you help me to learn more?

(Another definition for breccia that I've seen is " Type of rock".)

I've seen this clue in The Guardian.

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