Crossword Genius

How old is bird in Dorset seaside resort? (7)

Ross

I believe the answer is:

swanage

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

'dorset seaside resort?' is the definition.
(I've seen this before)

'how old is bird' is the wordplay.
I cannot really understand how this works, but
'bird' could be 'swan' (swan is a kind of bird) and 'swan' is found within the answer.
'how old' could be 'age' (I've seen this before) and 'age' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?

(Another definition for swanage that I've seen is " Dorset seaside resort".)

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