Aggressively male Chinese leader touring Switzerland (5)
I believe the answer is:
macho
'aggressively male' is the definition.
(I've seen this before)
'chinese leader touring switzerland' is the wordplay.
'chinese leader' becomes 'mao' (I've seen this before).
'touring' indicates putting letters inside (touring can mean going round).
'switzerland' becomes 'ch' (short for Confoederatio Helvetica, its Latin name).
'mao' placed around 'ch' is 'MACHO'.
(Other definitions for macho that I've seen before include "Ultra-masculine" , "Laddish" , "Like aggressive male" , "Butch" , "Spiny lobster" .)