They have one point each; one more would be needless (7)

I believe the answer is:

needles

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'they have one point each one more would' is the definition.
The definition suggests an adverb but the answer is not.

'be needless' is the wordplay.
'be' becomes 'need' (needing is a kind of being).
'needless' becomes 'les' (I can't justify this - if you can you should believe this answer much more).
'need'+'les'='NEEDLES'

Can you help me to learn more?

(Other definitions for needles that I've seen before include "Western point of the Isle of Wight" , "Sewers; annoys" , "Sewing aids" , "Isle of Wight feature - irritates" , "styluses" .)

I've seen this clue in The Globe and Mail.

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