Put back in forest or earth (7)
I believe the answer is:
restore
'put back' is the definition.
(I've seen this before)
'in forest or earth' is the wordplay.
'in' says the answer is hidden in the clue.
'RESTORE' is hidden within 'forest or earth'.
(Other definitions for restore that I've seen before include "Bring back to original state" , "Bring back, reinstate" , "Repair, put back" , "Renew, repair; give back" , "hand it back?" .)