Partially stun armadillo to render harmless (5)

I believe the answer is:

unarm

'render harmless' is the definition.
(synonyms)

'partially stun armadillo to' is the wordplay.
'partially' says the answer is hidden in the clue.
'UNARM' can be found hidden inside 'stun armadillo to'.

(Other definitions for unarm that I've seen before include "Remove firing pieces" , "Remove weapons from" , "Make harmless" , "Take weapon" , "Disable" .)

I've seen this clue in The Everyman puzzle in The Observer.

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