Time-waster is a little scoundrel, dithering around (5)
I believe the answer is:
idler
'time-waster' is the definition.
(I've seen this in another clue)
'a little scoundrel dithering around' is the wordplay.
'a little' says the answer is hidden in the clue (a little bit of the clue).
'around' says the letters should be written in reverse.
'reldi' is hidden within 'scoundrel dithering'.
'reldi' back-to-front is 'IDLER'.
'is' acts as a link.
(Other definitions for idler that I've seen before include "stationary car perhaps?" , "One reluctant to work" , "Not working so hard" , "Bum" , "who makes no effort" .)