A trial of innate strength (4)

I believe the answer is:

test

'a trial' is the definition.
(I know that trial can be written as test)

'of innate strength' is the wordplay.
'of' indicates a hidden word.
'TEST' can be found hidden inside 'innate strength'.

(Other definitions for test that I've seen before include "Trial - international game" , "Exam to play international cricket" , "Trial - big match" , "Audition" , "Dip one's toe in" .)

I've seen this clue in the Evening Standard.

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