Material for McDormand's first Oscar will grow on you (6)

I believe the answer is:

mohair

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

I don't understand the rest of the clue.

(Other definitions for mohair that I've seen before include "Fabric made from fine silky wool of goat" , "Fine silky wool of the angora goat" , "coat required" , "Fine silky coat of angora goat" , "Fabric made from Angora goat wool" .)

I've seen this clue in the Irish Times.

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