Crossword Genius

Len involved with hot pants contests (11)

Ross

I believe the answer is:

pentathlons

'contests' is the definition.
(pentathlon is a kind of contest)

'len involved with hot pants' is the wordplay.
'involved with' indicates an anagram (involved can mean confusing or complex).
'hot'+'pants'='hotpants'
'len' with its letters anagrammed with 'hotpants' can make 'PENTATHLONS'.

(Another definition for pentathlons that I've seen is " Multi-event contests".)

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