Crossword Genius

I come back to a matter of trivial importance (4)

Ross

I believe the answer is:

iota

I'm a little stuck... Click here to teach me more about this clue!

'matter of trivial importance' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'i come back to a' is the wordplay.
'come back' is a reversal indicator.
'to' reversed gives 'ot'.
'i'+'ot'+'a'='IOTA'

Can you help me to learn more?

(Other definitions for iota that I've seen before include "Foreign character" , "Extremely small amount" , "The Greek i (4)" , "(Not one) little bit" , "A little piece" .)

I've seen this clue in The Irish News.
Want a hint initially instead of a full solution? Install my app