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Accompany a POW unit after being shot (4,4)

Ross

I believe the answer is:

wait upon

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'accompany' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'a pow unit after being shot' is the wordplay.
'after' means one lot of letters go next to another.
'being shot' indicates an anagram.
'a'+'pow'+'unit'='apowunit'
'apowunit' is an anagram of 'WAIT UPON'.

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I've seen this clue in The Telegraph.
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