Puck takes measures leading to consequences (7)
I believe the answer is:
impacts
'to consequences' is the definition.
(impact is a kind of consequence)
'puck takes measures leading' is the wordplay.
'puck' becomes 'imp' (I've seen this in another clue).
'takes measures' becomes 'acts' ('act' can be a synonym of 'take measures').
'leading' means one lot of letters go next to another.
'imp'+'acts'='IMPACTS'
(Other definitions for impacts that I've seen before include "It's camp (anag)" , "Collisions of jolts" , "Bumps into, collides with" .)