Take on board again unfinished wine sailors eye (8)
I believe the answer is:
reabsorb
'take on board again' is the definition.
'unfinished wine sailors eye' is the wordplay.
'unfinished' means to remove the last letter.
'wine' becomes 'red' (red is a type of wine).
'sailors' becomes 'abs' (AB is short for able seaman).
'eye' becomes 'orb' (I've seen this before).
'red' with its last letter removed is 're'.
're'+'abs'+'orb'='REABSORB'
(Other definitions for reabsorb that I've seen before include "Again assimilate" , "imbibe again" , "Take back in" .)