Immoderate display of leg on demand (6)
I believe the answer is:
wanton
'immoderate' is the definition.
(thesaurus)
'leg on demand' is the wordplay.
'leg' becomes 'on' (cricket term, fielding positions).
'on' is a charade indicator (letters next to each other).
'demand' becomes 'want' (want is a kind of demand).
'on' put after 'want' is 'WANTON'.
'display of' acts as a link.
(Other definitions for wanton that I've seen before include "Irresponsible, lacking proper restraint" , "Immoral; motiveless" , "Wilful - promiscuous" , "Irresponsible like vandal, lacking proper motives" , "Malicious -- licentious" .)