Frogman (5)
I believe the answer is:
diver
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">frogman</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for diver that I've seen before include "Competitor in pool" , "Drive (anag.)" , "Frogman" , "Grebe maybe" , "Underwater worker" .)