Husband entertained by more amusing American poet (8)
I believe the answer is:
whittier
'poet' is the definition.
(I've seen this before)
'husband entertained by more amusing american' is the wordplay.
I cannot quite understand how this works, but
'husband' could be 'h' and 'h' is found within the answer.
'more amusing' could be 'wittier' (I've seen this before) and 'wittier' is found in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for whittier that I've seen is " Poet".)