Crossword Genius

Twice a year, left from Rome? (5)

Ross

I believe the answer is:

papal

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'from rome?' is the definition.
I can't tell whether this defines the answer.

'twice a year left' is the wordplay.
'twice' shows that letters should be duplicated.
'a year' becomes 'pa' (per annum).
'left' becomes 'l' (common abbreviation).
'pa' duplicated is 'papa'.
'papa'+'l'='PAPAL'

Can you help me to learn more?

(Other definitions for papal that I've seen before include "Like some bulls" , "of Catholic high-up" , "Of the highest Vatican authority" , "Relating to the Pope" , "Relating to the Pontiff" .)

I've seen this clue in The Times.
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