Aluminum source (3)

I believe the answer is:

ore

'aluminum source' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ore that I've seen before include "Mined material" , "14 [CURRENCY UNIT]" , "Mineral aggregate" , "Deposit of mine" , "Metal-bearing rock or mineral" .)

I've seen this clue in the Newsday.

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