Oily girl?

I believe the answer is:

olive

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This clue might be a double definition.

'oily' is the first definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'girl?' is the second definition.

Can you help me to learn more?

(Other definitions for olive that I've seen before include "Tree - shade of green" , "Girl's name; tree" , "Fruit; Popeye's girlfriend" , "yellowish green" , "One's stoned" .)

I've seen this clue in The Irish Independent.

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