Do a puzzle (5)
I believe the answer is:
solve
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">do a puzzle</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 solve that I've seen before include "Work out (a clue)" , "Work out (a problem)" , "Find the 3dn to a mystery" , "Figure out the answer" , "Find the key - work out" .)