Fool's bit of rope cut at both ends (3)
I believe the answer is:
ass
'fool's' is the definition.
(both can mean a stupid person)
'bit of rope cut at both ends' is the wordplay.
'bit of rope' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cut' becomes 'sexless' (synonyms).
'at both ends' says to hollow out the word (remove centre letters) (only the letters at the ends of the word).
'sexless' with its middle taken out is 'ss'.
'a'+'ss'='ASS'
Can you help me to learn more?
(Other definitions for ass that I've seen before include "Braying animal" , "Dipstick" , "One easily had" , "sap" , "Donkey or foolish person" .)