Further studies are organised among lefties? (7)
I believe the answer is:
rereads
'further studies' is the definition.
(further reads or studies of something)
'are organised among lefties?' is the wordplay.
'organised' indicates an anagram.
'among' indicates putting letters inside (inserted letters are placed among others).
'lefties?' becomes 'reds' (red can mean a left-wing person).
'are' with letters rearranged gives 'rea'.
'rea' inserted into 'reds' is 'REREADS'.
(Other definitions for rereads that I've seen before include "Scans again" , "Studies again" , "Peruses again" .)