Well done, Henry! (6)

I believe the answer is:

hooray

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'well done henry' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for hooray that I've seen before include "Exclamation of joy or victory" , "Shout of joy (for Henry?)" , "Hurrah" , "Shout of approval" , "Yippee!" .)

I've seen this clue in The Guardian.

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