I and the guys follow first rule, for example a particular procedure (7)
I believe the answer is:
regimen
'a particular procedure' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'i and the guys follow first rule for example' is the wordplay.
'and' is a charade indicator (letters next to each other).
'the guys' becomes 'men' (guy can mean a man).
'follow' means one lot of letters go next to another.
'first rule' becomes 'r' (1st letter of 'rule').
'for example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'i' put next to 'men' is 'imen'.
'r'+'eg'='reg'
'imen' after 'reg' is 'REGIMEN'.
Can you help me to learn more?
(Other definitions for regimen that I've seen before include "(In medicine) a systematic plan for therapy" , "Prescribed course of diet, exercise, etc" , "Plan for e.g. diet" , "Therapeutic programme (of diet and exercise)" , "Government - course of treatment" .)