Clue: Like the centre of Bordeaux, without barriers and without weapons (11)
Answer: DEFENCELESS
Explanation: DE is the centre of Bor-DE-aux + FENCELESS="without barriers"
 
 
I could also see a parsing where DE, FENCELESS is "Like the centre of Bordeaux", with 'fenceless' referring to a lack of outer letters – this would mean that "without barriers" becomes part of the definition