Crossword Genius

Trio cease performing - they're largely unknown (9)

Ross

I believe the answer is:

esoterica

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'largely unknown' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'trio cease performing' is the wordplay.
'performing' indicates anagramming the letters.
'trio'+'cease'='triocease'
'triocease' anagrammed gives 'ESOTERICA'.

'they're' acts as a link.

Can you help me to learn more?

(Other definitions for esoterica that I've seen before include "collection of specialist stuff" , "secrets to a few" , "Highly specialised subjects" , "things not seen by many?" , "Coarse tie? (anag)" .)

I've seen this clue in The Independent.
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