Change Morse and Lewis? (7)

I believe the answer is:

coppers

I believe this clue is a double definition.

'change' is the first definition.
(as in copper coins)

'morse and lewis?' is the second definition.
(detectives in books by Colin Dexter)

(Other definitions for coppers that I've seen before include "Officers" , "Old pennies and policemen" , "change maybe" , "Receptacles" , "hardly any 11 [LOLLY]" .)

I've seen this clue in The Guardian.

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