Hint just not started (5)
I believe the answer is:
imply
'hint' is the definition.
(hint can mean to imply or suggest)
'just not started' is the wordplay.
'just' becomes 'simply' (synonyms).
'not started' means to remove the first letter.
'simply' with its first letter taken away is 'IMPLY'.
(Other definitions for imply that I've seen before include "Hint, suggest" , "Cause to be inferred" , "Insinuate, hint" , "Intimate, suggest indirectly" , "Insinuate or suggest" .)