Cover over bathing beach (4)
I believe the answer is:
lido
'bathing beach' is the definition.
(I've seen this before)
'cover over' is the wordplay.
'cover' becomes 'lid' (lid is a kind of cover).
'over' becomes 'o' (cricket abbreviation).
'lid'+'o'='LIDO'
(Other definitions for lido that I've seen before include "Venice's beach island facing the Adriatic" , "bathing facilities" , "Swimming and leisure area" , "bathing-beach" , "Outdoor swimming pool" .)