Food supplement damaging koalas to some extent (6)

I believe the answer is:

gingko

'food supplement' is the definition.
(gingko leaves are a food supplement)

'damaging koalas to some extent' is the wordplay.
'to some extent' indicates the answer is hidden within the clue.
'GINGKO' is hidden in the letters of 'damaging koalas'.

(Another definition for gingko that I've seen is " Chinese tree".)

I've seen this clue in The Times.

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