A decent number of veils (5)

I believe the answer is:

seven

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'of veils' is the definition.
The definition suggests a singular noun which matches the answer.

'a decent number' is the wordplay.
'a decent' becomes 'seve' (I can't justify this - if you can you should believe this answer much more).
'number' becomes 'n'.
'seve'+'n'='SEVEN'

Can you help me to learn more?

(Other definitions for seven that I've seen before include "- Against Thebes (Aeschylus)" , "Number of colours of the rainbow" , "Number of Wonders of the World" , "Prime number" , "Number (of stars in the sky?)" .)

I've seen this clue in the Evening Standard.

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