In a way I serve to tell practically nothing (4,2,6)

I believe the answer is:

ever so little

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'practically nothing' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'in a way i serve to tell' is the wordplay.
'in a way' is an anagram indicator.
'i'+'serve'+'to'+'tell'='iservetotell'
'iservetotell' with letters rearranged gives 'EVER SO LITTLE'.

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

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