Bird seen in the museum (3)
I believe the answer is:
emu
'bird' is the definition.
(emu is a type of bird)
'in the museum' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EMU' is hidden in the letters of 'the museum'.
'seen' is the link.
(Other definitions for emu that I've seen before include "Parky's nemesis" , "Hull's character" , "Big bird" , "Long-necked bird" , "Aussie runner" .)