What’s blocked movement to cut down trees and conserve (3,3)
I believe the answer is:
log jam
'what's blocked movement' is the definition.
(a log jam blocks movement)
'cut down trees and conserve' is the wordplay.
'cut down trees' becomes 'log' (log can mean to cut down a tree).
'and' is a charade indicator (letters next to each other).
'conserve' becomes 'jam' (jam is a kind of conserve).
'log'+'jam'='LOG-JAM'
'to' acts as a link.
(Other definitions for log jam that I've seen before include "Seemingly irresolvable situation" , "Major stoppage" , "Deadlock; river blockage" , "Blockage of progress" , "A deadlock or work accumulation" .)