Not lordly but reasonable (5)
I believe the answer is:
sober
This might be a double definition.
'not lordly' is the first definition.
'sober' can be an answer for 'lordly' (thesaurus). I'm not certain of the 'not' bit.
'reasonable' is the second definition.
(thesaurus)
'but' acts as a link.
Can you help me to learn more?
(Other definitions for sober that I've seen before include "Sedate - staid" , "Earnest" , "Unaffected by drink" , "Abstinent" , "Abstemious in robes" .)