Entertained a male American editor (6)
I believe the answer is:
amused
'entertained' is the definition.
(synonyms)
'a male american editor' is the wordplay.
'male' becomes 'm' (common abbreviation).
'american' becomes 'us' (abbreviation for United States).
'editor' becomes 'ed' (abbreviation).
'a'+'m'+'us'+'ed'='AMUSED'
(Other definitions for amused that I've seen before include "was entertaining" , "Victoria reputedly wasn't" , "Mildly entertained by Medusa" , "Mildly diverted or entertained" , "Delighted" .)