Communication from one who should inherit (masculine), so it's said (7)
I believe the answer is:
airmail
'communication' is the definition.
(I know that airmail is a type of mail)
'one who should inherit masculine so it's said' is the wordplay.
'one who should inherit' becomes 'air' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'masculine' becomes 'male' (associated in meaning).
'so it's said' indicates a 'sounds like' (homophone) clue.
'male' sounds like 'mail'.
'air'+'mail'='AIRMAIL'
'from' is the link.
Can you help me to learn more?
(Other definitions for airmail that I've seen before include "Post going by plane" , "Speedy deliveries" , "It's marked "par avion"" , "Postal system f" , "Flying service" .)