Horrid ugly things not good for recycling (9)
I believe the answer is:
unsightly
'horrid' is the definition.
(something unsightly is horrible to look at)
'ugly things not good for recycling' is the wordplay.
'not' is a deletion indicator.
'good' becomes 'g' (abbreviation).
'for recycling' is an anagram indicator.
'ugly'+'things'='uglythings'
'uglythings' with 'g' taken out is 'ulythings'.
'ulythings' anagrammed gives 'UNSIGHTLY'.
(Other definitions for unsightly that I've seen before include "wild?" , "Displeasing to the eye" , "Not pleasing on the eye" , "Unpleasant to look at" , "Ugly" .)