Crossword Genius

Tuba (anag) (4)

Ross

I believe the answer is:

abut

(Other definitions for abut that I've seen before include "End or lean against, say a building" , "Tuba (anag)" , "Touch upon" , "Adjoin, be contiguous to" , "Cease (from activity)" .)

I've seen this clue in The Guardian.
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