Like the centre of Bordeaux, without barriers and without weapons (11)
I believe the answer is:
defenceless
'without weapons' is the definition.
(having no defences or weapons)
'like the centre of bordeaux without barriers' is the wordplay.
'like the centre of' says to take the centre.
'without barriers' becomes 'fenceless' (fence is a kind of barrier).
The middle letters of 'bordeaux' are 'de'.
'de'+'fenceless'='DEFENCELESS'
'and' acts as a link.
(Other definitions for defenceless that I've seen before include "Unguarded" , "Unprotected" , "Unable to withstand attack" , "Without protection" , "Lacking justification" .)