Radial patterns (6)
I believe the answer is:
treads
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">radial patterns</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for treads that I've seen before include "Stared at tyre surfaces" , "Sets the foot down." , "Steps, walks" , "Puts the foot down" , "mates" .)