Keep back Roman poet and entail working that's opportune (12)

I believe the answer is:

providential

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'opportune' is the definition.
(synonyms)

'keep back roman poet and entail working' is the wordplay.
'keep back' becomes 'pr' (I can't explain this - if you can you should believe this answer much more).
'roman poet' becomes 'ovid' (I've seen this in another clue).
'and' is a charade indicator (letters next to each other).
'working' is an anagram indicator.
'entail' is an anagram of 'ential'.
'pr'+'ovid'+'ential'='PROVIDENTIAL'

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for providential that I've seen before include "Very opportune" , "Lucky" , "Unexpectedly fortunate (as if arranged by God)" .)

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

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