Consent to father going on ship
I believe the answer is:
pass
'consent' is the definition.
(pass is a kind of consent)
'father going on ship' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'going on' means one lot of letters go next to another.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'pa'+'ss'='PASS'
'to' acts as a link.
(Other definitions for pass that I've seen before include "Get through exam" , "Decline to answer" , "exam grade ..." , "Go by; permit" , "I've no idea" .)