Crossword Genius

Bird: that female nesting in most important tree (10)

Ross

I believe the answer is:

kingfisher

I'm a little stuck... Click here to teach me more about this clue!

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

'female nesting in most important tree' is the wordplay.
'female' becomes 'she' ('she' refers to a woman).
'nesting in' is an insertion indicator.
'most important' becomes 'king' (I can't explain this - if you can you should believe this answer much more).
'tree' becomes 'fir' (fir tree is a kind of tree).
'king'+'fir'='kingfir'
'she' going within 'kingfir' is 'KINGFISHER'.

'that' is the link.

Can you help me to learn more?

(Other definitions for kingfisher that I've seen before include "Colourful river bird" , "Brightly-coloured bird" , "flyer" , "Colourful riverside bird" , "Creature" .)

I've seen this clue in The Telegraph.
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