Rejected sample bits I'm reviewing (6)

I believe the answer is:

vermis

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'rejected sample bits i'm reviewing' is the definition.
I can't tell whether this defines the answer.

'rejected sample bits i'm reviewing' is the wordplay.
'rejected' is a reversal indicator.
'sample' indicates a hidden word (I've seen this in other clues).
'simrev' can be found hidden inside 'bits im reviewing'.
'simrev' back-to-front is 'VERMIS'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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