Stuntman Earl dived at sea (9)
I believe the answer is:
daredevil
'stuntman' is the definition.
(I've seen this before)
'earl dived at sea' is the wordplay.
'at sea' indicates an anagram.
'earl'+'dived'='earldived'
'earldived' is an anagram of 'DAREDEVIL'.
(Other definitions for daredevil that I've seen before include "Reckless, impetuous and irresponsible person" , "Intrepid" , "Madcap" , "No cautious type" , "Reckless showoff" .)