Turns up, a fair amount of the menu during a period of abstinence produced by Subway (6)

I believe the answer is:

tunnel

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'subway' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for tunnel that I've seen before include "Excavated passage" , "Underground passageway" , "Underground passage for road or railway" , "Passage below ground" , "Passage through or under something" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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