Sea bird young Anne tries to hold (6)
I believe the answer is:
gannet
'sea bird' is the definition.
(I know that gannet is a type of pelecaniform seabird)
'young anne tries to hold' is the wordplay.
'to hold' indicates a hidden word (I've seen 'holds' mean this).
'GANNET' is hidden in the letters of 'young anne tries'.
(Other definitions for gannet that I've seen before include "A large diving sea-bird" , "Large diving fish" , "Act in accordance (with command)" , "Gluttonous type" , "Solan goose was this bird's former name" .)