The desire of an officer to tour the States? (4)
I believe the answer is:
lust
'the desire' is the definition.
(lust is a kind of desire)
'an officer to tour the states?' is the wordplay.
'an officer' becomes 'lt' (abbreviation for lieutenant).
'to tour' is an insertion indicator (to tour can mean to go around).
'the states?' becomes 'US' (abbreviation for the United States).
'lt' placed around 'us' is 'LUST'.
'of' acts as a link.
(Other definitions for lust that I've seen before include "Strong sexual desire" , "Lecherousness" , "Depraved desire" , "Passionate desire" , "Carnal desire" .)