When you hover above a district on the starmap it shows the district info at the bottom left, it says "Reinforcement" ... does that mean the number of clone packs on reserve for that district? If so, say you have a cargo hub with max clones, 450, and they all get wiped out and your attacker assumes control of the district, are the reinforcements in case you want to immediately attack them back? And if you don't, are the clones sold for the normal price and the isk returned to your corps wallet?

n00b Q but..

The reinforcement is just how clones would be deployed on the district once the timer clicks over. So for a 450 you will get +80 and 300 you will get +100 once the timer clicks over. If you were to launch an attack using a clone pack on a district with 180/300 that would in fact have 280 clones by the time the battle starts. If it was a reattack from a win then it would continue to loose clones and not reinforce the district. The clones generated from a district do no longer generate isk for the district holder. Each clones lost/killed on the district during battle will generate 150k per clone and be paid to the winning team only.