Coffee half-heartedly put on one side for afterwards (5)
I believe the answer is:
later
'afterwards' is the definition.
(synonyms)
'coffee half-heartedly put on one side' is the wordplay.
I cannot quite understand how this works, but
'heartedly' could be 'er' (I've seen this in other clues) and 'er' is located in the answer.
'on' could be 'at' (I've seen this in other clues) and 'at' is located in the answer.
'side' could be 'l' (abbreviation for left) and 'l' is located in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).
'for' is the link.
(Other definitions for later that I've seen before include "Alter (anag.)" , "When to see you?" , "Alert (anag.)" , "Tardier" , "More recent" .)