inexperienced revolutionary meeting the enemy when guns are fired (7)
I believe the answer is:
wartime
'when guns are fired' is the definition.
(guns are used in war)
'inexperienced revolutionary meeting the enemy' is the wordplay.
'inexperienced' becomes 'raw' (similar in meaning).
'revolutionary' says the letters should be written backwards (letters revolve around).
'meeting' says to put letters next to each other.
'the enemy' becomes 'time' (the enemy when speaking figuratively).
'raw' in reverse letter order is 'war'.
'war'+'time'='WARTIME'
(Another definition for wartime that I've seen is " Eg, nineteen thirty nine to nineteen fourty five".)