Claim knotty legal point (6)
I believe the answer is:
allege
'claim' is the definition.
(to allege something is to make a claim)
'knotty legal point' is the wordplay.
I cannot quite see how this works, but
an anagram of 'legal' is 'alleg' which is present in the answer.
'point' could be 'e' (compass point) and 'e' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for allege that I've seen before include "Declare or accuse without proof" , "Assert - maintain" , "Aver - maintain" , "Claim, suggest" , "Aver (without proof)" .)