Asian folk label a diary (7)

I believe the answer is:

tagalog

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'asian folk' 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?

'label a diary' is the wordplay.
'label' becomes 'tag' (synonyms).
'diary' becomes 'log' (log can mean a record or diary).
'tag'+'a'+'log'='TAGALOG'

Can you help me to learn more?

(Other definitions for tagalog that I've seen before include "Pacific islander" , "people in the Philippines" , "Asian language" .)

I've seen this clue in The Guardian.

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