Soak up the sailor's world! (6)
I believe the answer is:
absorb
'soak up' is the definition.
('absorb' can be a synonym of 'soak up')
'the sailor's world' is the wordplay.
'the sailor's' becomes 'abs' (abbreviation for able seaman).
'world' becomes 'orb' (I have seen 'The World' mean 'orb' so perhaps 'world' could also mean 'orb').
'abs'+'orb'='ABSORB'
(Other definitions for absorb that I've seen before include "Soak up - engross" , "hold" , "Suck up or take in" , "Soak up, as a sponge" , "Soak up (liquid)" .)