Bird Sean ogles endlessly (5)

I believe the answer is:

eagle

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'bird' is the definition.
(eagle is a kind of bird)

'sean ogles endlessly' is the wordplay.
'sean' becomes 'ea' (I am not sure about this - if you are sure you should believe this answer much more).
'endlessly' says to take the centre (the ends of the words are removed).
The centre of 'ogles' is 'gle'.
'ea'+'gle'='EAGLE'

Can you help me to learn more?

(Other definitions for eagle that I've seen before include "Bird with hooked bill and long broad wings" , "Old comic" , "Erne, perhaps" , "Bird of prey; former children's comic" , "A glee-ful bird?" .)

I've seen this clue in The Guardian.

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