Reclaim sodden land of delta before wet weather (5)
I believe the answer is:
drain
'reclaim sodden land' is the definition.
(drain water from land)
'delta before wet weather' is the wordplay.
'delta' becomes 'd' (phonetic alphabet: alpha, bravo, charlie etc.).
'before' means one lot of letters go next to another.
'wet weather' becomes 'rain' (rain is wet weather).
'd'+'rain'='DRAIN'
'of' is the link.
(Other definitions for drain that I've seen before include "Waste channel" , "See 11 dn" , "ditch" , "Draw off U sewer" , "Deprive of vitality" .)