Occupant of eyrie beginning to eat end of shoelace (6)
I believe the answer is:
eaglet
'occupant of eyrie' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'beginning to eat end of shoelace' is the wordplay.
'beginning to' says to take the initial letters.
'end of shoelace' becomes 'aglet' (I am not sure about this - if you are sure you should believe this answer much more).
The initial letter of 'eat' is 'e'.
'e'+'aglet'='EAGLET'
Can you help me to learn more?
(Other definitions for eaglet that I've seen before include "young flier?" , "Get ale for the young bird" , "another of the golden generation?" , "Young keen-sighted bird" , "Little bird" .)