Possible Clues:

• What about river flowing for bird?
• Ungainly shore bird
• Leggy bird? It's a surprise - she's the Cockney one at fitness centre!
• Bird with a curved neck
• Flying fish eater, one whose lover regularly swam north
• River with duck hemmed in by one bird and another
• Bird that woman takes on
• Bird's name leading literary figure put in first
• Is your bird the girl on the long legs?