Copper diffident, not demanding (5)

I believe the answer is:

cushy

'not demanding' is the definition.
(I've seen this before)

'copper diffident' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'diffident' becomes 'shy' (synonyms).
'cu'+'shy'='CUSHY'

(Other definitions for cushy that I've seen before include "16 21 [INDIAN IMPORT]" , "(Of situation) secure, easy (colloq.)" , "Undemanding, secure" , "Undemanding, easy" , "Easy, soft (colloq.)" .)

I've seen this clue in The Times.

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