Message that's hidden behind the Italian water cooler (2,4)
I believe the answer is:
la nina
'water cooler' is the definition.
(climate phenomenon in which the seas are cooler)
'message that's hidden behind the italian' is the wordplay.
'message that's hidden' becomes 'nina' (a nina is a hidden message eg in a crossword).
'behind' means one lot of letters go next to another.
'the italian' becomes 'la' ('the' in Italian).
'nina' after 'la' is 'LA NINA'.
I've seen this clue in the Independent.
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