Sailor gets 50 seated around (4)
I believe the answer is:
salt
'sailor' is the definition.
(salt is a kind of sailor)
'50 seated around' is the wordplay.
'50' becomes 'l' (Roman numeral).
'seated' becomes 'sat' ('sit' can be a synonym of 'seat').
'around' indicates putting letters inside.
'l' put inside 'sat' is 'SALT'.
'gets' acts as a link.
(Other definitions for salt that I've seen before include "A defence against ice" , "Condiment - experienced sailor" , "Common substance" , "Pile up" , "Liveliness" .)