Lichen's kin (4)
I believe the answer is:
moss
'lichen's kin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for moss that I've seen before include "Plant reproducing by spores" , "Small flowerless plant(s)" , "Former racing driver" , "Plant growing on many lawns" , "English racing driver, b. 1929" .)