Medic mentioned a plant to ease pain (4)

I believe the answer is:

dock

I'm a little stuck... Click here to teach me more about this clue!

'a plant to ease pain' is the definition.
I can't judge whether this definition defines the answer.

'medic mentioned' is the wordplay.
'medic' becomes 'doc' (doctor).
'mentioned' shows a homophone (sound like).
'doc' sounds like 'DOCK'.

Can you help me to learn more?

(Other definitions for dock that I've seen before include "Berthing area; cut" , "Cut < leaf" , "Where the accused is placed in court" , "box in court and > cut" , "Clip" .)

I've seen this clue in The Independent.

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