Side street boy (3)
I believe the answer is:
des
'boy' is the definition.
(short for Desmond)
'side street' is the wordplay.
'DES' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for des that I've seen before include "- O'Connor, Br. singer" , "and 9 Across: Former 'Countdown' host" .)