Keep it off clothes: some harm, otherwise (4)
I believe the answer is:
moth
'keep it off clothes' is the definition.
I can't tell whether this defines the answer.
'some harm otherwise' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'MOTH' can be found hidden inside 'harm otherwise'.
Can you help me to learn more?
(Other definitions for moth that I've seen before include "Shakespearean fairy?" , "Cloth-eating insect" , "Fairy like 13" , "night flyer" , "Small insect that lays its eggs in cloth or fabric" .)