Halt. Let’s be bursting into top health (3,3,4)

I believe the answer is:

all the best

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'into top health' is the definition.
I can't judge whether this defines the answer.

'halt let's be bursting' is the wordplay.
'bursting' indicates anagramming the letters.
'halt'+'lets'+'be'='haltletsbe'
'haltletsbe' with letters rearranged gives 'ALL THE BEST'.

Can you help me to learn more?

(Other definitions for all the best that I've seen before include "Good health!" , "flower, every bit of it?" , "A greeting" , "every member of the elite?" , "needing good luck!" .)

I've seen this clue in the Sydney Morning Herald.

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