18 across
Cause
of
ludicrous
honey
wars
(6,3)
Cause of ludicrous honey wars (6,3)
hints
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checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Look at Cause at the start, that's your definition, since a reason why is what lies behind something happening. The rest is an anagram of HONEY WARS, with ludicrous telling you to shuffle the letters, and 'of' simply links the two halves together.