Crossword Genius

Camp sorry to change military formation (4,5)

Ross

I believe the answer is:

army corps

'military formation' is the definition.

'camp sorry to change' is the wordplay.
'to change' indicates an anagram.
'camp'+'sorry'='campsorry'
'campsorry' with letters rearranged gives 'ARMY CORPS'.

(Another definition for army corps that I've seen is " Military unit".)

I've seen this clue in The Times.
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