A male do, crazy and fashionable (1,2,4)
I believe the answer is:
a la mode
'fashionable' is the definition.
(a la mode can mean trendy or fashionable)
'a male do crazy' is the wordplay.
'crazy' indicates anagramming the letters.
'male'+'do'='maledo'
'maledo' is an anagram of 'lamode'.
'a'+'lamode'='A-LA-MODE'
'and' acts as a link.
(Other definitions for a la mode that I've seen before include "In fashion (French)" , "In the fashion, in Paris?" , "Do a meal in French style (1, 2, 4)" , "In the current fashion" , "In fashion - served with ice cream" .)