Distorted expression from serious expert (7)

I believe the answer is:

grimace

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'distorted expression' is the definition.
'grimace' can be an answer for 'expression' (I've seen this before). I'm not certain of the 'distorted' bit.

'serious expert' is the wordplay.
'serious' becomes 'grim'.
'expert' becomes 'ace' (ace can informally mean very good).
'grim'+'ace'='GRIMACE'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for grimace that I've seen before include "Smirk" , "Glower" , "Nasty expression" , "Frown" , "Twisted facial expression" .)

I've seen this clue in The Times.

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