Piece of foliage that may be considered lucky (10)

I think it could be either:

Which length description are you looking for?:

6,4

cloverleaf

(Other definitions for cloverleaf that I've seen before include "Motorway intersection" , "Lucky, if one of four" , "Level of car (anag) - type of road junction" .)

I've seen this clue in The Times.

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