Got hint to change after dark (7)
I believe the answer is:
tonight
'after dark' is the definition.
(when it gets dark)
'got hint to change' is the wordplay.
'to change' is an anagram indicator.
'got'+'hint'='gothint'
'gothint' anagrammed gives 'TONIGHT'.
(Other definitions for tonight that I've seen before include ""Not ____, Josephine!"" , "Hotting up for after sundown" , "now or very soon" , "the coming time for retirement" , "The end of today" .)