Cop, second one in Paris Match (7)
I believe the answer is:
mountie
'cop' is the definition.
('mounties' are the Royal Canadian Mounted Police)
'second one in paris match' is the wordplay.
'second' becomes 'mo' (both are short periods of time).
'one in paris' becomes 'un'.
'match' becomes 'tie' (I've seen this before).
'mo'+'un'+'tie'='MOUNTIE'
(Other definitions for mountie that I've seen before include "Canadian policeman" , "Canadian cop on a horse?" , "Member of the Royal Canadian Mounted Police" , "The lawman always gets his man!" , "One boasting of getting man" .)