Crossword Genius

Climber picked up medical supply (3)

Ross

I believe the answer is:

ivy

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'climber' is the definition.
(ivy is a climbing plant)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ivy that I've seen before include "Hedera helix" , "Vine with evergreen leaves" , "Climbing-plant" , "Girl" , "Poisonous plant" .)

I've seen this clue in The Telegraph.
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