See dry rot crippled warship (9)
I believe the answer is:
'warship' is the definition.
(destroyer is a kind of warship)
'see dry rot crippled' is the wordplay.
'crippled' is an anagram indicator.
'seedryrot' with letters rearranged gives 'DESTROYER'.
(Other definitions for destroyer that I've seen before include "Apollyon's", "Saboteur", "Type of warship", "Wrecker", "heavily armed warship".)