Turn into compost (5)
I believe the answer is:
decay
(Other definitions for decay that I've seen before include "Decline, decompose" , "Rot, moulder" , "'Decompose, rot (5)'" , "Rot, perish" , "Briefly fashionable" .)
I believe the answer is:
decay
(Other definitions for decay that I've seen before include "Decline, decompose" , "Rot, moulder" , "'Decompose, rot (5)'" , "Rot, perish" , "Briefly fashionable" .)