They carry brick to celebration (9,5)

I believe the answer is:

stretcher party

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'they carry' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'brick to celebration' is the wordplay.
'brick' becomes 'stretcher' (I've seen this before).
'to celebration' becomes 'party' (I've seen this in another clue).
'stretcher'+'party'='STRETCHER PARTY'

Can you help me to learn more?

(Another definition for stretcher party that I've seen is " it gives poorly folk a pick-up".)

I've seen this clue in The Daily Express.

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