Bird to lug seal about (7)
I believe the answer is:
seagull
'bird' is the definition.
(seagull is a kind of bird)
'lug seal about' is the wordplay.
'about' indicates anagramming the letters.
'lug'+'seal'='lugseal'
'lugseal' anagrammed gives 'SEAGULL'.
'to' acts as a link.
(Other definitions for seagull that I've seen before include "One sitting atop mast perhaps" , "Avian scavenger" , "Main creature" , "Marine bird" , "Bird paradoxically fond of landfill sites" .)