How Len tires of being an attentive fellow (8)
I believe the answer is:
listener
'an attentive fellow' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'how len tires' is the wordplay.
'how' is an anagram indicator (I've seen this in other clues).
'len'+'tires'='lentires'
'lentires' is an anagram of 'LISTENER'.
'of being' is the link.
Can you help me to learn more?
(Other definitions for listener that I've seen before include "one should be able to hear it" , "Eavesdropper" , "Member of radio audience" , "Person paying aural attention" , "Former BBC magazine" .)