Crossword Genius

Coppers on spot reported revolution (3,6)

Ross

I believe the answer is:

sea change

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

'spot reported revolution' is the definition.
The definition suggests a singular noun which matches the answer.

'coppers' is the wordplay.
I cannot quite understand how this works, but
'coppers' could be 'change' (I've seen this before) and 'change' is found within the answer.
The remaining letters 'sea' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'on' acts as a link.

Can you help me to learn more?

(Other definitions for sea change that I've seen before include "Significant transformation of marine origin" , "Profound transformation" , "Notable transformation" , "Significant or unexpected transformation - on the briny?" , "Major transformation" .)

I've seen this clue in The Telegraph and The Sun.
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