Stirling —, F1 World Drivers' Championship runner-up from 1955-57 (4)

I believe the answer is:

moss

(Other definitions for moss that I've seen before include "Small plant; peat bog" , "evidence of neglect?" , "that may hug trees?" , "English racing driver, b. 1929" , "Former racing driver" .)

I've seen this clue in The Mirror.

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