Being legless, sank drunkenly on the end of the settee (5)

I believe the answer is:

snake

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'being' is the definition.
(snake is a kind of being)

'sank drunkenly on the end of the settee' is the wordplay.
'drunkenly' indicates anagramming the letters.
'on' means one lot of letters go next to another.
'the end of' suggests the final letters.
The last letter of 'settee' is 'e'.
'sank' is an anagram of 'snak'.
'snak'+'e'='SNAKE'

'legless' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for snake that I've seen before include "Limbless reptile" , "former EC currency band" , "Long slender reptile" , "Wind" , "Carnivorous reptile" .)

I've seen this clue in the Evening Standard.

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