Seen in seas so rough they make your hair curl? (7)
I believe the answer is:
rollers
'seen in seas' is the definition.
Although both the answer and definition are plural nouns, I can't understand how one could define the other.
'rough they make your hair curl?' is the wordplay.
I cannot quite see how this works, but
'curl?' could be 'roll' (synonyms) and 'roll' is present in the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'so' is the link.
Can you help me to learn more?
(Other definitions for rollers that I've seen before include "They may be used to paint" , "expensive cars" , "Long heavy sea waves" .)