Let conservationists put grass outside (6)
I believe the answer is:
rented
'let' is the definition.
(I've seen this before)
'conservationists put grass outside' is the wordplay.
I cannot really see how this works, but
'conservationists' could be 'nt' (National Trust) and 'nt' is located in the answer.
'grass' could be 'reed' (type of grass plant) and 'reed' is present in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rented that I've seen before include "Let for money" , "Leased" , "Hired - tender (anag)" , "Taken for hire" .)