Legendary vessel’s slow movement leaving lake (4)
I believe the answer is:
argo
'legendary vessel's' is the definition.
'argo' can be an answer for 'vessel's' (I've seen this before). I'm not sure about the 'legendary' bit.
'slow movement leaving lake' is the wordplay.
'slow movement' becomes 'largo' (I've seen this before).
'leaving' suggests deleting specific letters.
'lake' becomes 'l' (geographical abbreviation).
'largo' with 'l' taken away is 'ARGO'.
Can you help me to learn more?
(Other definitions for argo that I've seen before include "Famous ship" , "Old sailing vessel" , "Fabulous ship" , "Old ship" , "Ship used by Jason in his search for the Golden Fleece" .)