18 across
Martin’s
residence
in
row
that’s
not
highly
rated?
(3-4)
Martin’s residence in row that’s not highly rated? (3-4)
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The definition is at the end of the clue.
How the clue works
Look at not highly rated? — that's your definition, as in somewhere that's only earned a single star. A martin's residence is a NEST, and you tuck that inside OAR (something you'd use to row), giving you O-NEST-AR.