Rates for musicians as part of system, possibly (6)

I believe the answer is:

tempos

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

'rates for musicians' is the definition.
'tempos' can be an answer for 'rates'. I'm not sure about the 'for musicians' bit.

'part of system possibly' is the wordplay.
'part of' says the answer is hidden in the clue.
'TEMPOS' can be found hidden inside 'system possibly'.

'as' is the link.

Can you help me to learn more?

(Other definitions for tempos that I've seen before include "Speeds at which compositions are played" , "Musical speeds" , "Times" .)

I've seen this clue in The Guardian.

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