Crossword Genius

Cover nothing in the swimming pool (4)

Ross

I believe the answer is:

lido

'the swimming pool' is the definition.
(lido is a type of open-air swimming pool)

'cover nothing' is the wordplay.
'cover' becomes 'lid' (lid is a kind of cover).
'nothing' becomes 'o' (O resembles 0).
'lid'+'o'='LIDO'

'in' is the link.

(Other definitions for lido that I've seen before include "Aquatic leisure centre" , "Public bathing beach" , "---- di Jesolo, Italian Adriatic resort" , "Swim here" , "Swimming bath" .)

I've seen this clue in The Irish News.
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