City trumpeter, perhaps, given great deal (7)

I believe the answer is:

swansea

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'city' is the definition.
(I know that Swansea is a city)

'trumpeter perhaps given great deal' is the wordplay.
'trumpeter' becomes 'swan' (I've seen this in another clue).
'perhaps given great deal' becomes 'sea' (I can't justify this - if you can you should believe this answer much more).
'swan'+'sea'='SWANSEA'

Can you help me to learn more?

(Other definitions for swansea that I've seen before include "Welsh city" , "Ecstasy, a win! (anag)" , "Birthplace of Dylan Thomas" , "South Wales city" , "coastal location" .)

I've seen this clue in The Times.

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