Good copyist who looks stupid (5)

I believe the answer is:

gaper

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'looks stupid' is the definition.
The definition suggests a singular noun which matches the answer.

'good copyist' is the wordplay.
'good' becomes 'g' (abbreviation).
'copyist' becomes 'aper' (I've seen this before).
'g'+'aper'='GAPER'

'who' is the link.

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(Other definitions for gaper that I've seen before include "one visibly amazed" , "one staring in wonder" , "who yawns?" , "Fish; burrowing mollusc" , "Anglerfish" .)

I've seen this clue in The Guardian.

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