Appointed region from the east supplies gas (7)
I believe the answer is:
aerates
'appointed' is the definition.
Although both the answer and definition are verbs, they are not in the same form of the verb.
'region from the east supplies gas' is the wordplay.
'region' becomes 'area' ('area' can be a synonym of 'region').
'from the east' is a reversal indicator.
'supplies gas' becomes 'tes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'area' reversed gives 'aera'.
'aera'+'tes'='AERATES'
Can you help me to learn more?
(Other definitions for aerates that I've seen before include "fans" , "Pumps carbon dioxide into" , "Puts fizz into a drink" , "Adds carbon dioxide to liquid under pressure" , "Brings gas" .)