Endlessly lordly, perhaps, yet amusing (5)
I believe the answer is:
droll
'amusing' is the definition.
(I've seen this before)
'endlessly lordly perhaps' is the wordplay.
'endlessly' means to remove the last letter.
'perhaps' is an anagram indicator.
'lordly' with its last letter removed is 'lordl'.
'lordl' with letters rearranged gives 'DROLL'.
'yet' acts as a link.
(Other definitions for droll that I've seen before include "Drily amusing" , "Zany" , "Amusing in offbeat way" , "Oddly amusing or comical" , "rum" .)