Wild as nights in a Sussex town (8)
I believe the answer is:
hastings
'a sussex town' is the definition.
(town in East Sussex)
'wild as nights' is the wordplay.
'wild' indicates an anagram.
'as'+'nights'='asnights'
'asnights' anagrammed gives 'HASTINGS'.
'in' acts as a link.
(Other definitions for hastings that I've seen before include "South coast resort" , "somewhere in Sussex" , "Ten sixty six battle" , "Town in East Sussex" , "Sussex battle" .)