Again organise seaside town (6)
I believe the answer is:
resort
'seaside town' is the definition.
(seaside resort)
'again organise' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'organise' becomes 'sort' (I've seen this in another clue).
're'+'sort'='RESORT'
(Other definitions for resort that I've seen before include "haunt" , "Scarborough?" , "Place for holidays" , "Frequently visited place" , "Delightful place to take a break" .)