People on forums having no time for puzzles (6)
I believe the answer is:
posers
'puzzles' is the definition.
(I've seen this in another clue)
'people on forums having no time' is the wordplay.
'people on forums' becomes 'posters' (people who post on online forums).
'having no' indicates named letters should be taken away.
'time' becomes 't' (abbreviation).
'posters' with 't' taken out is 'POSERS'.
'for' is the link.
(Other definitions for posers that I've seen before include "Baffling questions" , "Puzzling questions or problems" , "They pretend to be something they're not" .)