MP blocking company law comes to agreement (7)
I believe the answer is:
compact
'to agreement' is the definition.
(compact can mean an agreement)
'mp blocking company law' is the wordplay.
'blocking' indicates putting letters inside (block can mean to plug a gap in something).
'company' becomes 'co' (abbreviation).
'law' becomes 'act' (I've seen this in other clues).
'co'+'act'='coact'
'mp' inserted within 'coact' is 'COMPACT'.
'comes' is the link.
(Other definitions for compact that I've seen before include "woman's case" , "Close - agreement - make-up case" , "Mutual agreement" , "'Condensed, portable (7)'" , "Tightly grouped" .)