Type of communication requiring great help, possibly (9)
I believe the answer is:
telegraph
'type of communication' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'great help possibly' is the wordplay.
'possibly' indicates an anagram.
'great'+'help'='greathelp'
'greathelp' is an anagram of 'TELEGRAPH'.
'requiring' is the link.
Can you help me to learn more?
(Other definitions for telegraph that I've seen before include "Means of communication" , "paper" , "Daily" , "System of communication over wires" , "A scoreboard" .)