Leaving for example on steamship (6)
I believe the answer is:
egress
'leaving' is the definition.
(I've seen this before)
'example on steamship' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'on' becomes 're' (regarding).
'steamship' becomes 'ss' (nautical abbreviation).
'eg'+'re'+'ss'='EGRESS'
'for' acts as a link.
(Other definitions for egress that I've seen before include "The act of going out" , "Come out" , "W ay out" , "Escape route" , "Emergence, coming out" .)