Green clumps on rocks (4)
I believe the answer is:
moss
(Other definitions for moss that I've seen before include "Clear < tiny plants" , "Damp-loving plant" , "It grows" , "It carpets moist shady places" , "A rolling stone gathers none" .)
I believe the answer is:
moss
(Other definitions for moss that I've seen before include "Clear < tiny plants" , "Damp-loving plant" , "It grows" , "It carpets moist shady places" , "A rolling stone gathers none" .)