Captured soldier and queen might (5)
I believe the answer is:
power
'might' is the definition.
(being mighty)
'captured soldier and queen' is the wordplay.
'captured soldier' becomes 'pow' (I can't justify this - if you can you should believe this answer much more).
'and' says to put letters next to each other.
'queen' becomes 'ER' (short for Elizabeth Regina ie Queen Elizabeth).
'pow'+'er'='POWER'
Can you help me to learn more?
(Other definitions for power that I've seen before include "Large amount" , "Exponent" , "Government" , "Strength, force" , "Electricity or strength" .)