Reject solid law (8)
I believe the answer is:
disallow
'reject solid law' is the definition.
'disallow' can be an answer for 'reject' (I've seen this in another clue). I'm not certain of the 'solid law' bit.
'reject solid law' is the wordplay.
'reject' is an anagram indicator (I've seen 'rejecting' mean this).
'solid'+'law'='solidlaw'
'solidlaw' is an anagram of 'DISALLOW'.
Can you help me to learn more?
(Other definitions for disallow that I've seen before include "Prevent" , "Refuse to accept as valid, as judge might a claim" , "Overrule" , "Rule out" , "bar" .)