Large panties oddly discarded right after that (5)
I believe the answer is:
later
'after that' is the definition.
(thesaurus)
'large panties oddly discarded right' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'oddly discarded' means one should take alternating letters (letters in odd-numbered positions removed).
'right' becomes 'r' (abbreviation).
The alternating letters of 'panties' are 'ate'.
'l'+'ate'+'r'='LATER'
(Other definitions for later that I've seen before include "Alter (anag.)" , "Subsequently" , "Not just yet" , "after an interval" , "At some time afterwards" .)