Play around with fault covering resistance - that's clever (6)
I believe the answer is:
artful
'clever' is the definition.
('artful' can be similar in meaning to 'clever')
'play around with fault covering resistance' is the wordplay.
'play around with' indicates anagramming the letters (I've seen 'plays around with' mean this).
'covering' indicates putting letters inside.
'resistance' becomes 'r' (abbreviation).
'fault' anagrammed gives 'atful'.
'atful' going around 'r' is 'ARTFUL'.
'that's' acts as a link.
(Other definitions for artful that I've seen before include "Giving a false appearance of frankness" , "Clever like Dickens's Dodger" , "Crafty like Dicken's Dodger" , "Clever, tricky" , "Oliver Twist's pal was an . . . . . . dodger" .)