Tusk material (5)

I believe the answer is:

ivory

'tusk material' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ivory that I've seen before include "Key perhaps" , "Off-white colour" , "Film director" , "Country on the Gulf of Guinea, a former French protectorate" , "Material from tusks of certain mammals" .)

I've seen this clue in The Star Tribune, the Penny Press, The Mirror, The Times, The Independent, the King Feature Syndicate, The Telegraph, the Evening Standard and The Sun.

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