Eighteen letters back from "table" (4)

I believe the answer is:

rota

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This might be a double definition.

'eighteen letters' is the first definition.
'rota' can be an answer for 'letters' (thesaurus). I'm not sure about the 'eighteen' bit.

'back from table' is the second definition.
'rota' can be an answer for 'table' (thesaurus). I'm not sure about the 'back from' bit.

Can you help me to learn more?

(Other definitions for rota that I've seen before include "supreme Catholic court" , "Ecclesiastical tribunal" , "Duty schedule" , "Task list, roster" , "List of people taking turns" .)

I've seen this clue in the Evening Standard.

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