Crossword Genius

Lectured on small radii (6)

Ross

I believe the answer is:

spokes

'radii' is the definition.
('spoke' can be a synonym of 'radius')

'lectured on small' is the wordplay.
'lectured' becomes 'spoke' (I've seen this in another clue).
'on' is a charade indicator (letters next to each other).
'small' becomes 's' (abbreviation - e.g. clothes size).
'spoke'+'s'='SPOKES'

(Other definitions for spokes that I've seen before include "Parts of a wheel" , "Radials of a wheel" , "Radial supports on a wheel" , "Bicycle wheel struts" .)

I've seen this clue in The Mirror.
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