About eleven the ship moves off (6)
I believe the answer is:
steams
'moves off' is the definition.
'steams' can be an answer for 'moves' (steaming is a kind of moving). I am unsure of the 'off' bit.
'about eleven the ship' is the wordplay.
'about' means one lot of letters goes inside another.
'eleven' becomes 'team' (eleven or XI can mean a football team).
'the ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'team' inserted within 'ss' is 'STEAMS'.
Can you help me to learn more?
(Other definitions for steams that I've seen before include "Emits vapours" , "Cooks using evaporated water" , "Rises as vapour" , "Cooks with water vapour" .)