Times leader agreeing minimally with company regulation (5)
I believe the answer is:
bylaw
'company regulation' is the definition.
(law made by a company)
'times leader agreeing minimally with' is the wordplay.
'times' becomes 'by' (both can mean 'multiplied by').
'minimally' indicates taking the first letters (minimal amounts of the word).
'with' becomes 'w' (short for with).
The initial letters of 'leader agreeing' is 'la'.
'by'+'la'+'w'='BYLAW'
(Other definitions for bylaw that I've seen before include "Local authority regulation" , "Local rule" , "Local ordinance" .)