Nail evil outside right (4)
I believe the answer is:
brad
'nail' is the definition.
(brad is a kind of nail)
'evil outside right' is the wordplay.
'evil' becomes 'bad' ('bad' is associated in meaning with 'evil').
'outside' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'bad' enclosing 'r' is 'BRAD'.
(Other definitions for brad that I've seen before include "-- Pitt, US actor" , "Small tapering nail" , "Type of nail" , "One to get hammered" , "Small tapered nail" .)