Crossword Genius

More impenetrable (6)

Ross

I believe the answer is:

denser

'more impenetrable' is the definition.
('dense' can be similar in meaning to 'impenetrable')

This is the entire clue.

(Another definition for denser that I've seen is " More impenetrable".)

I've seen this clue in the Irish Times (Simplex), the Newsday and The Guardian.
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