They study hard, starting second week of this semester (5)

I believe the answer is:

swots

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'they study hard' is the definition.
The definition suggests an adverb but the answer is not.

'starting second week of this semester' is the wordplay.
'starting' says to take the initial letters.
The first letters of 'second week of this semester' is 'SWOTS'.

Can you help me to learn more?

(Another definition for swots that I've seen is " They study intensively".)

I've seen this clue in the Sydney Morning Herald.

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