Papers, I see, love part of the US (5)
I believe the answer is:
idaho
'part of the us' is the definition.
(Idaho is a US state)
'papers i see love' is the wordplay.
'papers' becomes 'ID' (identification papers).
'i see' becomes 'ah' (exclamation used to indicate understanding).
'love' becomes 'o' (love means zero in tennis).
'id'+'ah'+'o'='IDAHO'
(Other definitions for idaho that I've seen before include "found in America" , "US state bordering Canada" , "State of NW US" , "O, I had a change in this state" , "The Gem State (US)" .)