She and I organised gallery stall (8)
I believe the answer is:
hesitate
'stall' is the definition.
(I've seen this before)
'she and i organised gallery' is the wordplay.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'organised' is an anagram indicator.
'gallery' becomes 'tate' (I've seen this before).
'she' after 'i' is 'ishe'.
'ishe' is an anagram of 'hesi'.
'hesi'+'tate'='HESITATE'
(Other definitions for hesitate that I've seen before include "Do this perhaps to be lost" , "Dither, waver" , "Show indecision" , "Pause, think twice" , "Lack confidence" .)