Wading bird putting a restraint on a seabird (7)

I believe the answer is:

bittern

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'wading bird' is the definition.
(bittern is a type of wading bird)

'a restraint on a seabird' is the wordplay.
'a restraint on' becomes 'bitt' (I am not sure about this - if you are sure you should believe this answer much more).
'a seabird' becomes 'ern' (I've seen this in another clue).
'bitt'+'ern'='BITTERN'

'putting' acts as a link.

Can you help me to learn more?

(Other definitions for bittern that I've seen before include "Booming marsh bird" , "Bird of marshes" , "large wader" , "''He shall not hear the ... cry / In the wild sky where he is lain'' (Lament for Thomas MacDonagh)" , "inhabitant of marsh" .)

I've seen this clue in The Irish Independent.

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