Declined (5)
'declined' is the definition.
('wane' can be a synonym of 'decline')
This is the entire clue.
(Other definitions for waned that I've seen before include "Decreased in size" , "Ebbed; declined" , "grew faint" , "(Of moon) grew smaller" .)
'declined' is the definition.
('refuse' can be a synonym of 'decline')
This is all the clue.
(Other definitions for refused that I've seen before include "Was unwilling to accept" , "Not accepted" , "Said no (7)" , "turned down appeal" , "Declined, rejected" .)
(Other definitions for slid that I've seen before include "Slipped" , "Moved smoothly along a surface" , "Skidded, slewed" , "Moved (eg, on ice)" .)