Sea veteran (3,4)
I believe the answer is:
old salt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sea veteran</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for old salt that I've seen before include "'Long-time sailor (3,4)'" , "Experienced sailor of saline sort" , "Experienced sailor with stale sodium chloride?" , "Tar" , "'Ancient mariner (3,4)'" .)