Restrictions and rules not good (5)
I believe the answer is:
reins
'restrictions' is the definition.
(I've seen this before)
'rules not good' is the wordplay.
'rules' becomes 'reigns' (reign can mean to rule or govern).
'not' indicates named letters should be taken away.
'good' becomes 'g' (abbreviation).
'reigns' with 'g' taken away is 'REINS'.
'and' is the link.
(Other definitions for reins that I've seen before include "Harnesses" , "water regulators?" , "Means of controlling a horse" , "Guiding straps" , "Restrictions" .)