Strongly and solidly built (6)
I believe the answer is:
sturdy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">strongly and solidly built</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 sturdy that I've seen before include "Well-constructed" , "Stout, brawny" , "Strong and solidly built" , "Strong and sturdily built" , "Solidly made" .)