Powerful dog (5,4)
I believe the answer is:
great dane
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">powerful dog</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 great dane that I've seen before include "Pet" , "Large 11" , "Dog -- a tad green (anag)" , "Powerful dog" , "Hamlet possibly" .)