Can segment save a verse omitted by allegory? (9)

I believe the answer is:

separable

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'can segment save a verse omitted' is the definition.
I can't judge whether this definition defines the answer.

'by allegory?' is the wordplay.
'by' becomes 'se' (I can't justify this - if you can you should believe this answer much more).
'allegory?' becomes 'parable' ('parable' can be a synonym of 'allegory').
'se'+'parable'='SEPARABLE'

Can you help me to learn more?

(Other definitions for separable that I've seen before include "not permanently joined together?" , "That may be disjoined" .)

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

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