Dawdler (7)
I believe the answer is:
laggard
'dawdler' is the definition.
(I know that dawdler can be written as laggard)
This is all the clue.
(Other definitions for laggard that I've seen before include "See straggler" , "Person falling behind" , "Dawdler" , "slower than expected" , "who's getting behind?" .)