Crossword Genius

Black bird round a lake to see swell (7)

Ross

I believe the answer is:

balloon

'swell' is the definition.
(both can mean to expand or increase)

'black bird round a lake' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'bird' becomes 'loon' (loon is a kind of bird).
'round' indicates putting letters inside.
'lake' becomes 'L' (geographical abbreviation).
'b'+'loon'='bloon'
'a'+'l'='al'
'bloon' enclosing 'al' is 'BALLOON'.

'to see' is the link.

(Other definitions for balloon that I've seen before include "See 21" , "Inflatable - rapidly expand" , "plaything" , "In which Charlie Brown expressed himself" , "Inflate" .)

I've seen this clue in The Sun.
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