Arts complex on the London Underground? (8)

I believe the answer is:

barbican

(Other definitions for barbican that I've seen before include "Watchtower over a castle gate - bin a crab (anag)" , "Fortification's watchtower" , "Outer defence of a castle or walled city" , "Defensive tower above fortified city gate" , "6D 5A [TUBE STATION]" .)

I've seen this clue in The Guardian.

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