Old Greek warrior catching cold in choppy sea (8)
I believe the answer is:
achilles
'old greek warrior' is the definition.
'achilles' can be an answer for 'warrior' (I've seen this before). I'm not certain of the 'old greek' bit.
'cold in choppy sea' is the wordplay.
'cold' becomes 'chill' (chill can mean cold).
'in' is an insertion indicator.
'choppy' indicates anagramming the letters (choppy implies disruption).
'sea' with letters rearranged gives 'aes'.
'chill' put inside 'aes' is 'ACHILLES'.
'catching' is the link.
Can you help me to learn more?
(Other definitions for achilles that I've seen before include "Weak-heel warrior" , "Greek hero with a weak point" , "Famous Greek" , "Legendary hero with weak spot" , "great hero" .)