Calm kid following lead of adventurer (2,4)
I believe the answer is:
at ease
'calm' is the definition.
(I've seen this before)
'kid following lead of adventurer' is the wordplay.
'kid' becomes 'tease' (both can mean to mock).
'following' is a charade indicator (letters next to each other).
'lead of' says to take the initial letters (I've seen 'leading' mean this).
The first letter of 'adventurer' is 'a'.
'tease' after 'a' is 'AT EASE'.
(Other definitions for at ease that I've seen before include "Calm" , "Relaxing - that's a military order" , "'Relaxed (2,4)'" , "Relax - that's an army order" , "Free from discomfort - that's an order" .)