Offer initially withdrawn after intervention by American customer (3-4)

'customer' is the definition.
(I've seen this before)

'offer initially withdrawn after intervention by american' is the wordplay.
'offer' becomes 'render'.
'initially withdrawn' means to remove the first letter.
'after intervention by' indicates putting letters inside (to intervene can mean to become involved in).
'american' becomes 'us' (abbreviation for United States).
'render' with its first letter taken away is 'ender'.
'ender' going around 'us' is 'END-USER'.