Deride beginning of June's expected electoral reforms (4)
I believe the answer is:
jeer
'deride' is the definition.
(I've seen this before)
'beginning of june's expected electoral reforms' is the wordplay.
'beginning of' indicates taking the first letters.
The first letters of 'junes expected electoral reforms' is 'JEER'.
(Other definitions for jeer that I've seen before include "Mock rudely" , "Rude, mocking remark" , "Barrack" , "Scoff, deride, mock" , "Call out derisively" .)