Like the order to put a stop, somehow, to Capone (6)
I believe the answer is:
postal
'like the order to' is the definition.
I can't tell whether this defines the answer.
'a stop somehow to capone' is the wordplay.
'somehow' indicates anagramming the letters.
'to capone' becomes 'Al' (gangster Al Capone).
'stop' is an anagram of 'post'.
'post'+'al'='POSTAL'
'put' is the link.
Can you help me to learn more?
(Other definitions for postal that I've seen before include "Relating to mail service" , "Relating to mail delivery" , "To do with snail mail" , "to go so mad in America" , "To Alps (anag.)" .)