Crawlers get after new landlord (8)
I believe the answer is:
licensee
'landlord' is the definition.
(I've seen this before)
'crawlers get after new' is the wordplay.
'crawlers' becomes 'lice' (I've seen this before).
'get' becomes 'see' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'see' put after 'n' is 'nsee'.
'lice'+'nsee'='LICENSEE'
(Other definitions for licensee that I've seen before include "One with permit to sell alcoholic drinks" , "One legally entitled to sell alcoholic drinks" , "One allowed to sell alcohol" , "The one holding official permission" , "local host, perhaps" .)