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Volunteers, on an annual occasion, for a sort of show (6)

Ross

I believe the answer is:

talent

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

'sort of show' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe there's a link between them I don't understand?

'volunteers on an annual occasion' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'an annual occasion' becomes 'lent' (I can't explain this - if you can you should believe this answer much more).
'ta'+'lent'='TALENT'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for talent that I've seen before include "able people" , "Natural ability or flair" , "At Lent (anag.)" , "Clever folk" , "Natural aptitude of an old coin" .)

I've seen this clue in the Evening Standard.
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