Hot water swirling round? Don't mention it! (3,3)
I believe the answer is:
the war
'don't mention it' is the definition.
'hot water swirling round?' is the wordplay.
'hot' becomes 'h'.
'swirling round?' indicates anagramming the letters.
'h'+'water'='hwater'
'hwater' with letters rearranged gives 'THE WAR'.
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