Notes drawback for a number of kings (6)

I believe the answer is:

edward

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'number of kings' is the definition.
'edward' can be an answer for 'kings' (I've seen this before). I'm unsure of the 'number of' bit.

'notes drawback' is the wordplay.
'notes' becomes 'ed' ().
'drawback' becomes 'ward' (I've seen this in other clues).
'ed'+'ward'='EDWARD'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for edward that I've seen before include "Jointly the most popular name for a king of England" , "Elgar or Lear, for instance" , "The Queen's youngest son" , "Lear, maybe" , "Fellow" .)

I've seen this clue in The Daily Express.

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