All outside potty over handsome youth (6)
I believe the answer is:
apollo
'handsome youth' is the definition.
(I've seen this before)
'all outside potty over' is the wordplay.
'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' placed around 'po' is 'apoll'.
'apoll'+'o'='APOLLO'
(Other definitions for apollo that I've seen before include "Greek sun god and leader of the Muses" , "mission of high-flying Americans?" , "London theatre" , "Programme targeting satellite" , "Divine figure" .)