Man promoted by one former queen (7)
I believe the answer is:
soldier
'man' is the definition.
(soldier is a kind of man)
'promoted by one former queen' is the wordplay.
'promoted' becomes 'sold'.
'by' means one lot of letters go next to another.
'one' becomes 'i' (Roman numeral).
'former queen' becomes 'ER' (Elizabeth Regina, ie Queen Elizabeth).
'sold'+'i'+'er'='SOLDIER'
(Other definitions for soldier that I've seen before include "One of man's 22 20 [SEVEN AGES]" , "Member of the military" , "One enlisted" , "Warrior" , "Member of a fighting force" .)