I waited on northern criminal throughout the land (10)
I believe the answer is:
nationwide
'throughout the land' is the definition.
I can't judge whether this defines the answer.
'i waited on northern criminal' is the wordplay.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'criminal' indicates anagramming the letters.
'i'+'waited'+'on'+'n'='iwaitedonn'
'iwaitedonn' is an anagram of 'NATIONWIDE'.
Can you help me to learn more?
(Other definitions for nationwide that I've seen before include "for all of us" , "Across the whole country" .)