Infuriate general left out in action (6)
I believe the answer is:
enrage
'infuriate' is the definition.
(thesaurus)
'general left out in action' is the wordplay.
'left' becomes 'l' (common abbreviation).
'out' indicates named letters should be taken away.
'in action' indicates anagramming the letters (I've seen this in other clues).
'general' with 'l' removed is 'genera'.
'genera' is an anagram of 'ENRAGE'.
(Other definitions for enrage that I've seen before include "Make violently angry" , "Greatly anger" , "Provoke to fury" , "Make mad" , "Make someone extremely angry" .)