Burden of suspicion, usually? (4)

I believe the answer is:

onus

'burden' is the definition.
(I know that burden can be written as onus)

'of suspicion usually?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ONUS' can be found hidden inside 'suspicion usually'.

(Other definitions for onus that I've seen before include "Obligation - charge" , "albatross?" , "Liability" , "'Responsibility, task or burden (4)'" , "Capulet opponent (R&J)" .)

I've seen this clue in the Evening Standard.

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