He's unimportant, yes; a little backward, no (6)

I believe the answer is:

minion

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'he's unimportant yes a' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'little backward no' is the wordplay.
'little' becomes 'mini' ().
'backward' says the letters should be written backwards.
'no' back-to-front is 'on'.
'mini'+'on'='MINION'

Can you help me to learn more?

(Other definitions for minion that I've seen before include "Servile underling" , "Servant, favourite" , "Lowly worker" , "Servile dependant" , "Servile assistant" .)

I've seen this clue in the Evening Standard.

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