Army helicopter quickly circles hospital (6)

I believe the answer is:

apache

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'army helicopter' is the definition.
'apache' can be an answer for 'helicopter' (US army helicopter). I am not certain of the 'army' bit.

'quickly circles hospital' is the wordplay.
'quickly' becomes 'apace' (synonyms).
'circles' indicates putting letters inside.
'hospital' becomes 'h'.
'apace' going around 'h' is 'APACHE'.

Can you help me to learn more?

(Other definitions for apache that I've seen before include "American Indian - French gangster" , "nickname of US State" , "American Indian once found in Paris" , "American speech" , "Geronimo was of this native American tribe" .)

I've seen this clue in The Telegraph.

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