Crossword Genius

Uniform, black, acceptable to employers? (6)

Ross

I believe the answer is:

usable

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'acceptable to employers?' is the definition.
I can't tell whether this defines the answer.

'uniform black' is the wordplay.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'black' becomes 'sable' (heraldic term for black).
'u'+'sable'='USABLE'

Can you help me to learn more?

(Other definitions for usable that I've seen before include "Fit for purpose" , "not to be discarded?" , "Practical" , "at one's disposal" , "Like something functional" .)

I've seen this clue in The Times.
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