Extra work (8)
(Other definitions for bit part that I've seen before include "'Small role in film or play (3,4)'" , "Small acting role" , "cameo" , "Tool" , "extra work, perhaps" .)
I believe this clue is a double definition.
'extra' is the first definition.
(extra is a type of cricket run)
'work?' is the second definition.
(both can mean to operate something)
(Other definitions for run that I've seen before include "Possibly an extra" , "Move at speed" , "publish" , "Manage, operate" , "On the . . . - fleeing from pursuit" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">extra work</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 overtime that I've seen before include "Hours worked in excess of usual" , "Work beyond normal hours? Remove it" , "Extra hours (at work)" , "Hours worked and paid for beyond the usual amount" , "Work outside normal hours" .)