Go ahead and cable (4)
I believe the answer is:
lead
I believe this clue is a double definition.
'go ahead' is the first definition.
(I've seen this before)
'cable' is the second definition.
(thesaurus)
'and' acts as a link.
(Other definitions for lead that I've seen before include "Guide; metallic element" , "writing material" , "Guide by going in front" , "Metal; show the way" , "Chemical element, symbol Pb" .)