Deal devised about series in Sussex town (7)
I believe the answer is:
arundel
'sussex town' is the definition.
(I've seen this before)
'deal devised about series' is the wordplay.
'devised' indicates an anagram.
'about' is an insertion indicator.
'series' becomes 'run' (run is a kind of series**).
'deal' anagrammed gives 'adel'.
'adel' going around 'run' is 'ARUNDEL'.
'in' acts as a link.
(Other definitions for arundel that I've seen before include "somewhere in W Sussex" , "West Sussex town with a castle" , "English public school" , "Castle in W. Sussex" , "Norfolk seat" .)