Difficult to keep turbulent seas under pressure (8)
I believe the answer is:
harassed
'difficult to keep turbulent seas under pressure' is the definition.
I can't tell whether this definition defines the answer.
'difficult to keep turbulent seas' is the wordplay.
'difficult' becomes 'hard' (associated in meaning).
'to keep' means one lot of letters goes inside another.
'turbulent' indicates an anagram.
'seas' with letters rearranged gives 'asse'.
'hard' placed around 'asse' is 'HARASSED'.
Can you help me to learn more?
(Other definitions for harassed that I've seen before include "Constantly tormented" , "Plagued" , "Constantly intimidated" , "Pestered; under strain" , "Distraught" .)