More impenetrable (6)
I believe the answer is:
denser
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">more impenetrable</span>' is the definition.<br/ ><span class="explanation-format__explanation">('dense' can be similar in meaning to 'impenetrable')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for denser that I've seen is " More impenetrable".)
I've seen this clue in the Irish Times (Simplex), The Guardian and the Newsday.
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