Time-sharing has hidden trap (4)
I believe the answer is:
mesh
'trap' is the definition.
(thesaurus)
'time-sharing has hidden' is the wordplay.
'hidden' says the answer is hidden in the clue.
'MESH' can be found hidden inside 'time sharing has'.
(Other definitions for mesh that I've seen before include "Knit or weave for Shem" , "Get engaged" , "Engage; net" , "Interweave - netting" , "Grid, netting" .)