Essentially, many argued old fart is lacking grace (7)
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I believe the answer is:
angular
'old fart is lacking grace' is the definition.
I can't judge whether this definition defines the answer.
'essentially many argued' is the wordplay.
'essentially' indicates the central letters.
'argued' becomes 'gular' (I am not sure about this - if you are sure you should believe this answer much more).
The centre of 'many' is 'an'.
'an'+'gular'='ANGULAR'
Can you help me to learn more?
(Other definitions for angular that I've seen before include "stiff" , "Having sharp corners, lacking curves or smoothness" , "Having sharp edges or corners" , "Thin and bony - with sharp corners" , "Sharp cornered" .)
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