25 across
Only
fish
by
lake
close
to
jetty
(6)
Only fish by lake close to jetty (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Only. The wordplay builds the answer by stringing together SOLE (a fish), L (the abbreviation for lake), and Y (the last letter — the "close" — of jetty).