A seal about to lug off something floating in the water (7)
I believe the answer is:
seagull
'something floating in the water' is the definition.
I can't tell whether this definition defines the answer.
'a seal about to lug' is the wordplay.
'about' is an anagram indicator.
'seal' with its letters anagrammed with 'lug' gives 'SEAGULL'.
'off' is the link.
Can you help me to learn more?
(Other definitions for seagull that I've seen before include "Bird paradoxically fond of landfill sites" , "Avian scavenger" , "One sitting atop mast perhaps" , "Marine bird" , "Main creature" .)