Right fuss involving one form of communication (5)
I believe the answer is:
radio
'form of communication' is the definition.
(I've seen this in another clue)
'right fuss involving one' is the wordplay.
'right' becomes 'r' (common abbreviation).
'fuss' becomes 'ado' (synonyms).
'involving' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'ado' placed around 'i' is 'adio'.
'r'+'adio'='RADIO'
(Other definitions for radio that I've seen before include "MW, LW or FM sound source" , "Wireless broadcast" , "Receiving apparatus" , "Receiving device" , "Broadcast medium" .)