The pigs don't ruin a garden feature (7,4)
I believe the answer is:
potting shed
'a garden feature' is the definition.
The definition suggests a singular noun which matches the answer.
'the pigs don't ruin' is the wordplay.
'ruin' is an anagram indicator.
'the'+'pigs'+'dont'='thepigsdont'
'thepigsdont' anagrammed gives 'POTTING SHED'.
Can you help me to learn more?
(Other definitions for potting shed that I've seen before include "outside store" , "Domestic nursery" , "Depths got in (anag) ? garden building" , "Where plants are put in containers with compost" , "Garden construction" .)