Phantom post office disappearing when parcel post is deregulated? (8)
I believe the answer is:
spectral
'phantom' is the definition.
(thesaurus)
'post office disappearing when parcel post is deregulated?' is the wordplay.
'post office' becomes 'po'.
'disappearing when' is a deletion indicator.
'is deregulated?' indicates anagramming the letters (I've seen 'is deregulated' mean this).
'parcel'+'post'='parcelpost'
'parcelpost' with 'po' taken away is 'parcelst'.
'parcelst' is an anagram of 'SPECTRAL'.
(Other definitions for spectral that I've seen before include "Ghastly" , "Like a colourful band" , "covering a range of colours" , "Spooky" , "Rap Celts for being ghostly" .)