Crossword Genius

Eight-footer in chair and out (8)

Ross

I believe the answer is:

arachnid

I'm a little stuck... Click here to teach me more about this clue!

'eight-footer' is the definition.
I can't judge whether this defines the answer.

'chair and out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'chair'+'and'='chairand'
'chairand' anagrammed gives 'ARACHNID'.

'in' is the link.

Can you help me to learn more?

(Other definitions for arachnid that I've seen before include "Spider or scorpion, e.g." , "Class of animals including spiders and scorpions" , "Group including spiders and scorpions" , "Member of the spider family" , "Spider in a chard" .)

I've seen this clue in The Sun.
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