Form of communication used in Roman times (5)
I believe the answer is:
latin
'form' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'communication used in roman times' is the wordplay.
'communication' becomes 'lati' (I can't explain this - if you can you should give a lot more credence to this answer).
'used in' says to take the centre (the letters used on the inside of the word).
'roman times' becomes 'nones' (I've seen this in another clue).
The central letter of 'nones' is 'n'.
'lati'+'n'='LATIN'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for latin that I've seen before include "Cicero's tongue" , "Language of ancient Rome" , "and 15 Down: Student area of Paris" , "The language of Virgil" , "ancient tongue" .)