Bowl over in test underarm (4)

I believe the answer is:

stun

'bowl over' is the definition.
(I've seen this before)

'in test underarm' is the wordplay.
'in' indicates the answer is hidden within the clue.
'STUN' is hidden in the letters of 'test underarm'.

(Other definitions for stun that I've seen before include "Dumbfound" , "Render insensitive" , "Daze, stupify" , "Shock into silence" , "Shock, flabbergast" .)

I've seen this clue in The Telegraph.

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