He is in charge right among the enemy (7)
I believe the answer is:
foreman
'he is in charge' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'right among the enemy' is the wordplay.
'right' becomes 'r' (abbreviation).
'among' indicates putting letters inside (inserted letters are placed among others).
'the enemy' becomes 'foeman' (I've seen this in another clue).
'r' inserted within 'foeman' is 'FOREMAN'.
Can you help me to learn more?
(Other definitions for foreman that I've seen before include "Fellow in charge" , "Male supervisor" , "Gaffer, boss" , "Gaffer, overseer" , "spokesman" .)