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Fare well, in a word, thanks to volunteers (2-2)

Ross

I believe the answer is:

ta-ta

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'fare well in a word' is the definition.
The definition suggests a singular noun which matches the answer.

'thanks to volunteers' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'to volunteers' becomes 'TA' (abbreviation for Territorial Army).
'ta'+'ta'='TA-TA'

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(Other definitions for ta-ta that I've seen before include "Bye-bye" , "Adieu" , "Bye!" , "Cheerio" , "A Farewell" .)

I've seen this clue in The Times.
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