Communication from English stately home covering discontented servant (7)
I believe the answer is:
epistle
'communication' is the definition.
(I know that epistle is a type of communication)
'english stately home covering discontented servant' is the wordplay.
'english' becomes 'E' (abbreviation).
'stately home' becomes 'pile' (I've seen this in other clues).
'covering' means one lot of letters goes inside another.
'discontented' means to remove the middle letters (the word's contents are removed).
'servant' with its middle removed is 'st'.
'pile' enclosing 'st' is 'pistle'.
'e'+'pistle'='EPISTLE'
'from' is the link.
(Other definitions for epistle that I've seen before include "Literary work" , "Letter from a saint" , "Writing" , "Apostle's letter" , "Such as St Paul wrote" .)