Everyone outside potty over handsome youth (6)
I believe the answer is:
apollo
'handsome youth' is the definition.
(I've seen this before)
'everyone outside potty over' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'outside' means one lot of letters goes inside another.
'potty' becomes 'po' (I've seen this in other clues).
'over' becomes 'o' (cricket abbreviation).
'all' going around 'po' is 'apoll'.
'apoll'+'o'='APOLLO'
(Other definitions for apollo that I've seen before include "US spacecraft" , "Greek (and Roman) god of light, poetry etc" , "Greek god of light, poetry, music, healing and prophecy" , "Japanese dish" , "Programme targeting satellite" .)