Covers too many circuits (8)
I believe the answer is:
overlaps
'covers' is the definition.
(overlapping is a kind of covering)
'too many circuits' is the wordplay.
'too many' becomes 'over' (I've seen this in other clues).
'circuits' becomes 'laps' ('lap' can be a synonym of 'circuit').
'over'+'laps'='OVERLAPS'
(Other definitions for overlaps that I've seen before include "Extends over or partly so" , "Coincides partially or wholly" .)