Relax grip on Liberal form of tenure (9)
I believe the answer is:
leasehold
'form of tenure' is the definition.
'leasehold' can be an answer for 'tenure' (I've seen this before). I'm not sure about the 'form of' bit.
'relax grip on liberal' is the wordplay.
'relax' becomes 'ease' (eg to ease a restriction is to relax it).
'grip' becomes 'hold' (synonyms).
'on' says to put letters next to each other.
'liberal' becomes 'l' (abbreviation).
'ease'+'hold'='easehold'
'easehold' after 'l' is 'LEASEHOLD'.
Can you help me to learn more?
(Other definitions for leasehold that I've seen before include "property that's let" , "Form of property tenure" , "Rented land" , "Type of tenure" , "housing agreement" .)