Amusingly has no mains and that's not attractive (4)
I believe the answer is:
ugly
'that's not attractive' is the definition.
I can't judge whether this defines the answer.
'amusingly has no mains' is the wordplay.
'has no' suggests deleting specific letters.
'amusingly' with 'mains' taken away is 'UGLY'.
'and' is the link.
Can you help me to learn more?
(Other definitions for ugly that I've seen before include "Unlovely" , "Like an eyesore" , "Frightful" , "offensive to look at" , "Sullen" .)