Influence rascal with deed (6)
I believe the answer is:
impact
'influence' is the definition.
(impact is a kind of influence)
'rascal with deed' is the wordplay.
'rascal' becomes 'imp' ('imp' can be a synonym of 'rascal').
'with' is a charade indicator (letters next to each other).
'deed' becomes 'act' (I've seen this before).
'imp'+'act'='IMPACT'
(Other definitions for impact that I've seen before include "The force of one body against another" , "The striking of one body against another" , "Force of colllision or blow" , "Bear upon" , "Significance" .)