What about skill required to make electrical connection? (5)
I believe the answer is:
earth
'electrical connection?' is the definition.
(I've seen this before)
'what about skill' is the wordplay.
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'about' is an insertion indicator.
'skill' becomes 'art' (both can mean a talent).
'eh' enclosing 'art' is 'EARTH'.
'required to make' is the link.
(Other definitions for earth that I've seen before include "electrical safety precaution" , "Heart of clay" , "It is necessary to clear" , "Huge cost" , "Make electrics safe" .)