Highlighting French article on Ding Liren playing (11)

I believe the answer is:

underlining

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'highlighting' is the definition.
Although both the answer and definition are present participle verbs, I don't understand how one could define the other.

'french article on ding liren playing' is the wordplay.
'french article' becomes 'un' (indefinite article in French).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'playing' is an anagram indicator.
'ding'+'liren'='dingliren'
'dingliren' is an anagram of 'derlining'.
'un'+'derlining'='UNDERLINING'

Can you help me to learn more?

(Another definition for underlining that I've seen is " Stressing".)

I've seen this clue in The Guardian.

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