Tanner's plums have an unusual look (7)

I believe the answer is:

sunlamp

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'tanner's' is the definition.
(something which gives someone a tan)

I don't understand the remainder of the clue.

(Other definitions for sunlamp that I've seen before include "Tanner" , "Device used in artificial tanning" , "Source of UV rays for cosmetic purposes" .)

I've seen this clue in the Sydney Morning Herald.

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