School checks faculty have good reasons for rifle permit? (6,7)

'rifle permit?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'school checks faculty have good reasons' is the wordplay.
'school' becomes 'sch' (abbreviation).
'checks' indicates putting letters inside (inserted letters are checked or controlled).
'faculty' becomes 'ear' (ear is a kind of faculty).
'have' is a charade indicator (letters next to each other).
'good reasons' becomes 'warrant' (I can't justify this - if you can you should give a lot more credence to this answer).
'sch' going around 'ear' is 'search'.
'search'+'warrant'='SEARCH-WARRANT'

'for' acts as a link.

Can you help me to learn more?