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When
the
tide
goes
out
one
might
view
such
accommodation!
(5)
When the tide goes out one might view such accommodation! (5)
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The whole clue is the definition (& lit or double definition).
How the clue works
The entire clue, When the tide goes out one might view such accommodation!, is your definition — a whimsical double meaning doing all the work on its own. Think of what's revealed at low tide (mudflats) and what you might rent in a city block (residential flats), and the penny drops.