American lawyer conceals materials (7)

I believe the answer is:

damasks

'materials' is the definition.
(damask is a kind of material)

'american lawyer conceals' is the wordplay.
'american lawyer' becomes 'DA' (abbreviation for District Attorney).
'conceals' becomes 'masks' (I've seen this in another clue).
'da'+'masks'='DAMASKS'

(Another definition for damasks that I've seen is " patterned fabrics".)

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