Crossword Genius

Remains of an oleaceous tree? (3)

Ross

I believe the answer is:

ash

This clue is a double definition.

'remains' is the first definition.
(remains of a fire)

'an oleaceous tree?' is the second definition.
(I've seen this before)

'of' is the link.

(Other definitions for ash that I've seen before include ". . . . [FOREST] One of which" , "Tree; fire residue" , "Rowan tree is also called the mountain . . ." , "Fraxinus" , "Hardwood" .)

I've seen this clue in The Times.
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