Superior fur is always worth having (6)

I believe the answer is:

usable

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'always worth having' is the definition.
I can't judge whether this definition defines the answer.

'superior fur' is the wordplay.
'superior' becomes 'u' (I've seen this in other clues).
'fur' becomes 'sable' (sable is a kind of fur).
'u'+'sable'='USABLE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for usable that I've seen before include "at one's disposal" , "Functional and available" , "(Of, eg, tool) employable" , "Of potential utility" , "Serviceable" .)

I've seen this clue in the Evening Standard.

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