Animal doctors (4)
I believe the answer is:
vets
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">animal doctors</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for vets that I've seen before include "old soldiers" , "13 doctors?" , "Inspects (animals?)" , "Investigates thoroughly to ensure suitability, for a job perhaps" , "Screens for the job perhaps" .)