International flier? (4)

I believe the answer is:

tern

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'international flier?' is the definition.
'tern' can be an answer for 'flier?' (type of bird). I am not sure about the 'international' bit.

'international flier?' is the wordplay.
'international' becomes 't' (I can't justify this - if you can you should believe this answer much more).
'flier?' becomes 'ern' (ern is a kind of birdanimal).
't'+'ern'='TERN'

Can you help me to learn more?

(Other definitions for tern that I've seen before include "Winger" , "Sea bird, a small gull" , "Three-masted schooner" , "flier" , "Rent out this gull" .)

I've seen this clue in the Evening Standard.

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