Carped absurdly, as a military policeman (6)

I believe the answer is:

redcap

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'a military policeman' is the definition.
(redcap is a kind of military policeman)

'carped absurdly' is the wordplay.
'carped' anagrams to 'REDCAP'.
But, I'm not clear how the anagram is indicated.

'as' is the link.

Can you help me to learn more?

(Other definitions for redcap that I've seen before include "MP" , "bird!" , "Member of the military police" , "Goldfinch" , "Carped (anag)" .)

I've seen this clue in the Evening Standard.

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