Striated planet going round, round (6)
I believe the answer is:
venous
'striated' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can sometimes define each other.
'planet going round round' is the wordplay.
'planet' becomes 'venus' (Venus is a planet).
'going round' is an insertion indicator (some letters go around others).
'round' becomes 'o' (o is a circular letter).
'venus' placed around 'o' is 'VENOUS'.
Can you help me to learn more?
(Other definitions for venous that I've seen before include "Of bodily channels" , "like a carrier of blood" , "Of blood tubes" , "through certain tubes" , "Relating to blood vessels" .)