Crossword Genius

German article on learner in school, not the brightest one? (7)

Ross

I believe the answer is:

plodder

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'not the brightest one?' is the definition.
I can't tell whether this definition defines the answer.

'german article on learner in school' is the wordplay.
'german article' becomes 'der' (definite article in German).
'on' is a charade indicator (letters next to each other).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'in' is an insertion indicator.
'school' becomes 'pod' (term for a group of marine mammals).
'l' going within 'pod' is 'plod'.
'der' after 'plod' is 'PLODDER'.

Can you help me to learn more?

(Other definitions for plodder that I've seen before include "Slow dull worker" , "One who walks laboriously or works slowly" .)

I've seen this clue in The Times.
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