Support, or a bit of help on the stormy sea (5)
I believe the answer is:
easel
'support' is the definition.
(easel is a kind of support)
'a bit of help on the stormy sea' is the wordplay.
'a bit of help' becomes 'el' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' indicates putting letters inside (as in clothing 'on' a person).
'the stormy' is an anagram indicator (stormy suggests disruption).
'sea' anagrammed gives 'ase'.
'el' placed around 'ase' is 'EASEL'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for easel that I've seen before include "Painter's support" , "Lease out the stand" , "Lease it out to the artist" , "Blackboard supporter" , "Picture support" .)