Crossword Genius

Major component of body paint, as you can hear (4)

Ross

I believe the answer is:

limb

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'major component of body' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for limb that I've seen before include "A supporter" , "Substantial branch from a tree trunk" , "Branch - member" , "as part of plane, say" , "Large tree branch" .)

I've seen this clue in The Times.
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