Breaking law's base and you get bird (7)
I believe the answer is:
swallow
'bird' is the definition.
(swallow is a kind of bird)
'breaking law's base' is the wordplay.
'breaking' indicates anagramming the letters.
'base' becomes 'low' ('low' can be a synonym of 'base').
'laws' anagrammed gives 'swal'.
'swal'+'low'='SWALLOW'
'and you get' is the link.
(Other definitions for swallow that I've seen before include "Buy < and consume" , "It's like a swift - gulp" , "One of these does not make a spring" , "Fork-tailed bird" , "Accept" .)