US legal outfit gets the bird (7)

I believe the answer is:

seagull

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

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

'us legal outfit gets' is the wordplay.
'us legal' anagrams to 'SEAGULL'.
However, I'm unsure how this is indicated.

'the' is the link.

Can you help me to learn more?

(Other definitions for seagull that I've seen before include "Avian scavenger" , "Bird paradoxically fond of landfill sites" , "Marine bird" , "One sitting atop mast perhaps" , "Main creature" .)

I've seen this clue in the Sydney Morning Herald.

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