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Kelvin currently on the shelf, it's learned (9)

Ross

I believe the answer is:

knowledge

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'it's learned' is the definition.
I can't judge whether this definition defines the answer.

'kelvin currently on the shelf' is the wordplay.
'kelvin' becomes 'K' (abbreviation for the unit of temperature).
'currently' becomes 'now' (I've seen this in another clue).
'on' says to put letters next to each other.
'the shelf' becomes 'ledge' ('ledge' can be a synonym of 'shelf').
'k'+'now'+'ledge'='KNOWLEDGE'

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(Other definitions for knowledge that I've seen before include "Proficiency - scholarship" , "Information - erudition" , "A little of it is said to be a dangerous thing" , "The result of perception, learning and reasoning" , "Information, learning or enlightenment" .)

I've seen this clue in The Telegraph.
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