Stupid to roll over stone in centre (5)
I believe the answer is:
midst
'centre' is the definition.
(I've seen this before)
'stupid to roll over stone' is the wordplay.
'stupid' becomes 'dim' (similar in meaning).
'to roll over' says the letters should be written in reverse (I've seen 'rolling over' mean this).
'stone' becomes 'st'.
'dim' back-to-front is 'mid'.
'mid'+'st'='MIDST'
'in' acts as a link.
(Other definitions for midst that I've seen before include "Among, amid" , "Centre" , "Thick (of things)" , "Blue dye; rainbow hue" , "Central part" .)