The sharp way to get electricity free! (5)
I believe the answer is:
acrid
'the sharp' is the definition.
(thesaurus)
'electricity free' is the wordplay.
'electricity' becomes 'ac' (AC is an example).
'free' becomes 'rid' ('rid' can be a synonym of 'free').
'ac'+'rid'='ACRID'
'way to get' is the link.
(Other definitions for acrid that I've seen before include "Stinging" , "Painfully pungent" , "Tart" , "irritating" , "Pungent or sharp, like smoke" .)