Crossword Genius

Two learners, kept in detention by fusspot, mucked up for periods (4,5)

Ross

I believe the answer is:

full stops

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'periods' is the definition.
(I know this)

'two learners kept in detention by fusspot mucked up' is the wordplay.
I cannot really understand how this works, but
'learners' could be 'll' (the abbreviation for learner driver written twice) and 'll' is found in the answer.
an anagram of 'fusspot' is 'fustops' which is within the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?

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