Cantankerous ill youngster straddles potty (5)

I believe the answer is:

silly

I'm a little stuck... Click here to teach me more about this clue!

'potty' is the definition.
(thesaurus)

'cantankerous ill youngster straddles' is the wordplay.
'SILLY' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for silly that I've seen before include "Ridiculous, frivolous" , "near the batsman" , "Preposterous" , "Not serious" , "Stupid" .)

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