Crossword Genius

Those with orders to carry out on battlefield? (9,5)

Ross

I believe the answer is:

stretcher party

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

'battlefield?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'those with orders to carry out on' is the wordplay.
I cannot quite see how this works, but
'on' could be 're' (regarding) and 're' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

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 Guardian.
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