Cleared fine grass (5)
I believe the answer is:
freed
'cleared' is the definition.
'fine grass' is the wordplay.
'fine' becomes 'f' (abbreviation).
'grass' becomes 'reed' (I've seen this before).
'f'+'reed'='FREED'
(Other definitions for freed that I've seen before include "Untied" , "Released" , "Defer being liberated" , "Emancipated, let loose" .)