Rabbi rebuilt prison tower (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)" , "Watchtower - London arts centre" , "Fortification's watchtower" , "Fortified watchtower over a city gate" , "Drawbridge defence" .)

I've seen this clue in The Sun.

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