Customer ordered nudes with expression of hesitation (3,4)
I believe the answer is:
end user
'customer' is the definition.
(I've seen this before)
'ordered nudes with expression of hesitation' is the wordplay.
'ordered' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'expression of hesitation' becomes 'er'.
'nudes' is an anagram of 'endus'.
'endus'+'er'='END-USER'
(Other definitions for end user that I've seen before include "One who finally receives a product" , "One getting the ultimate enjoyment" , "Product's final owner" , "One showing ultimate possession" , "not interested in the beginning?" .)