Crossword Genius

Country singer with simple material (8)

Ross

I believe the answer is:

cashmere

'material' is the definition.
(cashmere is a kind of material)

'country singer with simple' is the wordplay.
'country singer' becomes 'Cash' (Johnny Cash).
'with' says to put letters next to each other.
'simple' becomes 'mere' (synonyms).
'cash'+'mere'='CASHMERE'

(Other definitions for cashmere that I've seen before include "Fabric from fine goat's wool" , "Soft fabric made from goats' hair" , "See charm (anag)" , "Expensive wool? Search me" , "Fine soft wool for marchese" .)

I've seen this clue in The Telegraph.
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