Cable maybe trailing from electronic display (6)
I believe the answer is:
evince
'display' is the definition.
(I've seen this before)
'cable maybe trailing from electronic' is the wordplay.
'cable maybe' becomes 'vince' (Vince Cable).
'trailing' means one lot of letters go next to another.
'from electronic' becomes 'e' (as in e-mail, e-sports etc).
'vince' put after 'e' is 'EVINCE'.
(Other definitions for evince that I've seen before include "Express, show" , "Indicate or display, say a feeling" , "Make evident" , "Show or display clearly" , "Show or display, say feeling" .)