Damage in rain out at sea (9)

I believe the answer is:

ruination

'damage' is the definition.
(thesaurus)

'in rain out at sea' is the wordplay.
'at sea' is an anagram indicator.
'in'+'rain'+'out'='inrainout'
'inrainout' with letters rearranged gives 'RUINATION'.

(Other definitions for ruination that I've seen before include "Complete destruction or collapse" , "Utter destruction" , "Crippling defeat" , "Complete downfall" , "End" .)

I've seen this clue in The Telegraph.

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