Made us terribly entertained (6)
I believe the answer is:
amused
'entertained' is the definition.
(amusing is a kind of entertaining)
'made us terribly' is the wordplay.
'terribly' is an anagram indicator.
'made'+'us'='madeus'
'madeus' is an anagram of 'AMUSED'.
(Other definitions for amused that I've seen before include "Mildly diverted or entertained" , "Victoria reputedly wasn't" , "Kept someone entertained" , "Provoked mirth in" , "Made (someone) laugh" .)