Lawyer with regressive associate - a fierce creature with a taste for sailors (6)
I believe the answer is:
scylla
'a fierce creature with a taste for sailors' is the definition.
I can't tell whether this defines the answer.
'lawyer with regressive associate' is the wordplay.
'lawyer with' becomes 'sc' (I can't justify this - if you can you should believe this answer much more).
'regressive' says the letters should be written in reverse (to regress is to go backwards).
'associate' becomes 'ally' (ally is a kind of associate).
'ally' written backwards gives 'ylla'.
'sc'+'ylla'='SCYLLA'
Can you help me to learn more?
(Other definitions for scylla that I've seen before include "Mythical rock" , "Peril with Charybdis" , "Mythical sea monster" , "Legendary rock" , "legendary menace in Med" .)