Curative plant a governor allocated primarily among Liberals (7)
I believe the answer is:
allheal
'curative plant' is the definition.
'allheal' can be an answer for 'plant'. I'm not certain of the 'curative' bit.
'a governor allocated primarily among liberals' is the wordplay.
'governor' becomes 'HE' (His or Her Excellency, address for a governor).
'primarily' says to take the initial letters.
'among' means one lot of letters goes inside another (inserted letters are placed among others).
'liberals' becomes 'lll' (I can't explain this - if you can you should give a lot more credence to this answer).
The first letter of 'allocated' is 'a'.
'he'+'a'='hea'
'hea' inserted inside 'lll' is 'llheal'.
'a'+'llheal'='ALLHEAL'
Can you help me to learn more?
(Other definitions for allheal that I've seen before include "Valerian, perhaps" , "Plant regarded as panacea" .)