Superior fur of practical application (6)

I believe the answer is:

usable

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'superior fur of practical application' is the definition.
I can't judge whether this defines the answer.

'superior fur' is the wordplay.
'superior' becomes 'U' (U can mean upper-class, as in U and non-U speech).
'fur' becomes 'sable' (sable is a kind of fur).
'u'+'sable'='USABLE'

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(Other definitions for usable that I've seen before include "Functional, operational" , "Able to be utilised" , "Fit for employment" , "Not vain, presumably" , "(Of, eg, tool) employable" .)

I've seen this clue in the Evening Standard.

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