Staples possibly used for some Cassatt works (7)

I believe the answer is:

pastels

'for some cassatt works' is the definition.
(I've seen this in another clue)

'staples possibly' is the wordplay.
'possibly' indicates an anagram.
'staples' is an anagram of 'PASTELS'.

'used' is the link.

(Another definition for pastels that I've seen is " Pale hues".)

I've seen this clue in The Independent.

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