Crossword Genius

Given a drop from a can? (5)

Ross

I believe the answer is:

oiled

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'given a drop' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for oiled that I've seen before include "running smoothly?" , "get drunk" , "Cut" , "wasted" , "tipsy" .)

I've seen this clue in the Evening Standard.
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