Instruct, coach (5)
I believe the answer is:
train
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">instruct</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that instruct is the is a more specific form of the action of train.)</span><br/ ><br/ >'<span class="explanation-format__original">coach</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(both can mean to instruct a sportsperson)</span><br/ ><br/ ></span>
(Other definitions for train that I've seen before include "Learn a skill etc. through practice" , "Succession of carriages" , "Try to get fit" , "Help (someone) to become fit" , "tutor" .)