Abrupt Iberian princess readily discharged soldiers (8)
I believe the answer is:
infantry
'soldiers' is the definition.
(I've seen this before)
'abrupt iberian princess readily discharged' is the wordplay.
'abrupt iberian princess' becomes 'infant' (I can't explain this - if you can you should give a lot more credence to this answer).
'discharged' means to remove the middle letters (the letters inside the word released or discharged).
'readily' with its middle removed is 'ry'.
'infant'+'ry'='INFANTRY'
Can you help me to learn more?
(Other definitions for infantry that I've seen before include "Troops" , "Army unit of foot soldiers" , "Grunts" , "Foot-soldiers" , "Unmounted fighters" .)