Students in time drag their feet (5)

I believe the answer is:

dally

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'drag their feet' is the definition.
I can't judge whether this definition defines the answer.

'students in time' is the wordplay.
'students' becomes 'LL' (an abbreviation for learner driver written twice).
'in' indicates putting letters inside.
'time' becomes 'day' (day is a kind of time).
'll' inserted inside 'day' is 'DALLY'.

Can you help me to learn more?

(Other definitions for dally that I've seen before include "Trifle" , "Waste time" , "take time" , "Dawdle - delay" , "Procrastinate" .)

I've seen this clue in The Daily Express.

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