Put in an appearance outside retro car plant (8)

I believe the answer is:

camomile

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'plant' is the definition.
(camomile is a kind of plant)

I can't explain the remainder of the clue.

(Other definitions for camomile that I've seen before include "Ma, Clio and me have medicinal tea" , "Herb for tea (or lawn?)" , "Milo came with a medicinal plant" , "Aromatic plant used in tea" , "Sweet-smelling plant used to make medicine and lotion" .)

I've seen this clue in The Guardian.

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