Endlessly, a bland concoction seems uninteresting (5)
I believe the answer is:
banal
'uninteresting' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?
'endlessly a bland concoction' is the wordplay.
'endlessly' means to remove the last letter.
'concoction' indicates an anagram.
'a'+'bland'='abland'
'abland' with its final letter taken off is 'ablan'.
'ablan' is an anagram of 'BANAL'.
'seems' is the link.
Can you help me to learn more?
(Other definitions for banal that I've seen before include "'Hackneyed, trite (5)'" , "Tediously unoriginal" , "Boring or trivial" , "Mundane" , "Uninspiring" .)