Old oil vessel in which I go for a sail (6)
I believe the answer is:
cruise
'sail' is the definition.
(I know that sail can be written as cruise)
'old oil vessel in which i go' is the wordplay.
I cannot quite see how this works, but
'i' is present in the answer.
'vessel' could be 'cruse' (cruse is a kind of vessel) and 'cruse' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'for a' acts as a link.
Can you help me to learn more?
(Other definitions for cruise that I've seen before include "Holiday afloat - Kidman's ex" , "Voyage for holiday makers" , "Sail on a ship" , "Ship holiday" , "Holiday at sea" .)