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Sneer of German expert gaining edge (7)

Ross

I believe the answer is:

grimace

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'sneer of' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'german expert gaining edge' is the wordplay.
'german' becomes 'g' (abbreviation).
'expert' becomes 'ace' (ace is a kind of expert).
'gaining' is an insertion indicator.
'edge' becomes 'rim' (rim is a kind of edge).
'g'+'ace'='gace'
'gace' going around 'rim' is 'GRIMACE'.

Can you help me to learn more?

(Other definitions for grimace that I've seen before include "Nasty expression" , "Facial contortion expressive of pain or disgust" , "Contortion of face expressing pain" , "Expression of distaste" , "Expression of pain or disgust" .)

I've seen this clue in The Hindu.
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