Crossword Genius

Pretty charters drafted for group of ambulance staff (9,5)

Ross

I believe the answer is:

stretcher party

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

'group of ambulance staff' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Maybe there's a link between them I don't understand?

'pretty charters drafted' is the wordplay.
'pretty charters' anagrams to 'STRETCHER PARTY'.
However, I'm not clear how the anagram is indicated.

'for' is the link.

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 Hindu.
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