Fuming gran runs with extreme fury (5)
I believe the answer is:
angry
'fuming' is the definition.
(thesaurus)
'gran runs with extreme fury' is the wordplay.
'runs' indicates anagramming the letters.
'with extreme fury' becomes 'y' (I am not sure about this - if you are sure you should believe this answer much more).
'gran' anagrammed gives 'angr'.
'angr'+'y'='ANGRY'
Can you help me to learn more?
(Other definitions for angry that I've seen before include "Inflamed" , "In a temper" , "Incensed" , "Furious" , "Cross" .)