Extreme; serious (7)

I believe the answer is:

intense

I believe this is a double definition.

'extreme' is the first definition.
(similar in meaning)

'serious' is the second definition.
(I've seen this before)

(Other definitions for intense that I've seen before include "Forceful, concentrated" , "Profound" , "Great" , "In an extreme degree" , "Acute, concentrated" .)

I've seen this clue in The Telegraph.

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