Valuable copier ordered by American (8)
I believe the answer is:
precious
'valuable' is the definition.
(similar in meaning)
'copier ordered by american' is the wordplay.
'ordered' indicates an anagram.
'by' says to put letters next to each other.
'american' becomes 'us' (abbreviation for United States).
'copier' is an anagram of 'precio'.
'precio'+'us'='PRECIOUS'
(Other definitions for precious that I've seen before include "Having great value" , "Much loved" , "Cherished or of high worth" , "Very dear" , "Cherished, treasured" .)