Member of platoon flogged? That is right (7)
I believe the answer is:
soldier
'member of platoon' is the definition.
'soldier' can be an answer for 'member' (I have seen 'Member of army' mean 'soldier' so perhaps 'member' could also mean 'soldier'). I am not sure about the 'of platoon' bit.
'flogged? that is right' is the wordplay.
'flogged?' becomes 'sold' (flog can mean to sell).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'right' becomes 'r' (common abbreviation).
'sold'+'ie'+'r'='SOLDIER'
Can you help me to learn more?
(Other definitions for soldier that I've seen before include "serviceman" , "General or private" , "Person serving in army" , "Eg, private" , "20 down man" .)