Troublesome boy? (3)

I believe the answer is:

les

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'boy?' is the definition.
(short for Leslie)

'troublesome' is the wordplay.
'LES' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for les that I've seen before include "-- Miserables, musical" , "French article; name" , "Boy's name (abbr)" , "Short boy or girl" , "-- Dawson, English comic" .)

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