Thinkers with urge to move around fast (6,6)
I believe the answer is:
hunger strike
'fast' is the definition.
(hunger strike is a kind of fast)
'thinkers with urge to move' is the wordplay.
'with' means one lot of letters go next to another.
'to move' indicates an anagram.
'thinkers' after 'urge' is 'urgethinkers'.
'urgethinkers' is an anagram of 'HUNGER-STRIKE'.
'around' is the link.
(Other definitions for hunger strike that I've seen before include "Starvation protest" , "Non-violent protest" , "fast" .)