Crossword Genius

Treat badly when Erato, say, is included (6)

Ross

I believe the answer is:

misuse

'treat badly' is the definition.
(I've seen this before)

'erato say is included' is the wordplay.
'erato say' becomes 'muse' (erato is a kind of Muse).
'included' indicates putting letters inside.
'muse' placed around 'is' is 'MISUSE'.

'when' acts as a link.

(Other definitions for misuse that I've seen before include "Ill-treatment" , "bad practice" , "Treat badly, unfairly" , "bad treatment" , "Poor treatment" .)

I've seen this clue in The Telegraph.
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