Friend who cleans out the stables? (6)
I believe the answer is:
mucker
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">friend</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(affectionate term, as in 'my old mucker')</span><br/ ><br/ >'<span class="explanation-format__original">who cleans out the stables?</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(someone mucking out a stables)</span><br/ ><br/ ></span>
(Other definitions for mucker that I've seen before include "Friend (in a mess?)" , "Mate - shifter of rubbish" .)