Mention landlady getting a message (3,6)
I believe the answer is:
air letter
'message' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'mention landlady getting a' is the wordplay.
'mention' becomes 'ir' (I can't justify this - if you can you should give a lot more credence to this answer).
'landlady' becomes 'letter' (someone who 'lets').
'getting' means one lot of letters go next to another.
'ir'+'letter'='irletter'
'irletter' put after 'a' is 'AIR LETTER'.
Can you help me to learn more?
(Other definitions for air letter that I've seen before include "Item of overseas post" , "speedy delivery" , "Item of overseas mail" .)