International legislation is not impaired (6)
I believe the answer is:
intact
'not impaired' is the definition.
'international legislation' is the wordplay.
'international' becomes 'int'.
'legislation' becomes 'act' (I've seen this before).
'int'+'act'='INTACT'
'is' is the link.
(Other definitions for intact that I've seen before include "Undamaged, not broken" , "Whole and undamaged" , "Entire, untouched" , "without flaw?" , "Not damaged or missing a part" .)