Crossword Genius

Ancient Roman calendar showing period without food on island (5)

Ross

I believe the answer is:

fasti

'ancient roman calendar' is the definition.
(fasti were calendars used in ancient Rome)

'period without food on island' is the wordplay.
'period without food' becomes 'fast' (a fast is a period of abstaining from food).
'on' says to put letters next to each other.
'island' becomes 'i' (geographical abbreviation).
'fast'+'i'='FASTI'

'showing' acts as a link.

I've seen this clue in The Independent.
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