Crew has torn up outrageous legal document (6,7)
I believe the answer is:
search warrant
'legal document' is the definition.
(document allowing a search to take place)
'crew has torn up outrageous' is the wordplay.
'torn' indicates an anagram.
'up outrageous' becomes 'arrant' (as in a phrase like 'arrant nonsense'. I am not sure about the 'up' bit.).
'crew'+'has'='crewhas'
'crewhas' is an anagram of 'searchw'.
'searchw'+'arrant'='SEARCH-WARRANT'
Can you help me to learn more?
(Other definitions for search warrant that I've seen before include "Permission to look for stolen goods" , "Police right of entry" , "permit to probe" , "legal document" .)