Measure lawyers try to ban (7)
I believe the answer is:
embargo
'ban' is the definition.
(thesaurus)
'measure lawyers try' is the wordplay.
'measure' becomes 'em' (em is a kind of measure).
'lawyers' becomes 'bar' (I've seen this before).
'try' becomes 'go' (go is a kind of try).
'em'+'bar'+'go'='EMBARGO'
'to' acts as a link.
(Other definitions for embargo that I've seen before include "Commercial break" , "Trade sanction" , "Trade stoppage" , "Ban on commerce - mob rage (anag)" , "Admiralty order" .)