It's a bit poor if I certify an opening! (7)

I believe the answer is:

orifice

'an opening' is the definition.
(I know that opening can be written as orifice)

'it's a bit poor if i certify' is the wordplay.
'it's a bit' indicates a hidden word (I've seen 'bit of' mean this).
'ORIFICE' can be found hidden inside 'poor if i certify'.

(Other definitions for orifice that I've seen before include "For CIE, I look for an opening" , "Aperture" , "8 [OPENING]" , "Hole, opening" , "Vent" .)

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

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