Declined new pleas, on the day (6)
I believe the answer is:
lapsed
'declined' is the definition.
(I've seen this before)
'new pleas on the day' is the wordplay.
'new' indicates an anagram.
'on' is a charade indicator (letters next to each other).
'the day' becomes 'd' (abbreviation for day).
'pleas' with letters rearranged gives 'lapse'.
'lapse'+'d'='LAPSED'
(Other definitions for lapsed that I've seen before include "Ceased to practise faith" , "Became invalid (through lack of renewal)" , "Expired over pedals" , "Pleads, having failed to maintain standards" , "declined" .)