Leave sailor to support eliminating Spain (7)
I believe the answer is:
abscond
'leave' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
(Other definitions for abscond that I've seen before include "Bods can (anag.)" , "Make off (with the money?)" , "Leave hurriedly to escape a legal process" , "Take flight" , "Leave quickly and secretly" .)