Rod and a woman, one with spokes (5)
I believe the answer is:
radii
'spokes' is the definition.
('radius' can be a synonym of 'spoke')
'rod and a woman one' is the wordplay.
'rod' becomes 'ra' (I can't justify this - if you can you should believe this answer much more).
'and' means one lot of letters go next to another.
'a woman' becomes 'Di' (short for Diana).
'one' becomes 'i' (Roman numeral).
'ra'+'di'+'i'='RADII'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for radii that I've seen before include "Centre-circumference lines" , "Halves of diameters" , "Lines between the center and circumference of a circle" , "spoke several times" , "Half diameters" .)