Person employing American with little hesitation (4)
I believe the answer is:
user
'person' is the definition.
(I know that user is a type of person)
'american with little hesitation' is the wordplay.
'american' becomes 'US' (United States).
'with' is a charade indicator (letters next to each other).
'little hesitation' becomes 'er' (expression used when hesitating).
'us'+'er'='USER'
'employing' is the link.
(Other definitions for user that I've seen before include "Right long-established" , "Tech support caller?" , "One exploiting others" , "Person who takes drugs" , "Operator; drug addict" .)