In the turbulent sea roughly an hour, it is OK (9)
I believe the answer is:
authorise
'is ok' is the definition.
('ok'->'authorize' is in my internal thesaurus and 'ize'->'ise')
'in the turbulent sea roughly an hour it' is the wordplay.
'in the' indicates putting letters inside.
'turbulent' is an anagram indicator.
'roughly' indicates an anagram.
'sea' is an anagram of 'ase'.
'hour'+'it'='hourit'
'hourit' anagrammed gives 'uthori'.
'ase' enclosing 'uthori' is 'AUTHORISE'.
(Other definitions for authorise that I've seen before include "Give official permission to" , "licence" , "warrant" , "OK" , "I share out (anag.)" .)