I find it amusing that everyone thinks a Clan commander is going to react to Zell breaches by bringing a war ship in and glassing the surface. The commitment of all assets in a clan engagement have to be listed up front. To bring in forces outside of your opening bid is tantamount to treason for a clanner. Yes, they could bid their war ship in the opening bid, but would likely draw great contempt from their competitor.
Remember, clanners bid against each other for the right to take a battle. A clanner hopes to win with their final bid, but is able to bring down reinforcements equal to their competitors last bid with only a minor honour penalty. At a pinch, a clanner may bring down all forces included in their first bid, but this requires their competitors consent. To bring a war ship against land based opponents would be a massive loss of honour for a clan commander. First, they admit that they cannot win the battle on fair terms. Second, they use an asset so totally disproportionate to their needs that they have required Khan consent to use previously.
A clanner will not give a damn about what a spheriod thinks about them, but they care a great deal what the other warriors in their clan think of them. Clanners also apparently detest waste, and glassing a battle zone is the ultimate in waste. A clanner will stick to the assets allocated, not because Zell requires them to, but because to do otherwise pretty well equals career suicide.
Ultimately, if a clanner is facing defeat due to treachery, they will simply abandon Zell, and bring all their land forces to bear, but a war ship would be a pointless waste of assets. This is only if a clanner will adhere to Zell in the first place, and that is so unlikely when facing mercenaries as to be laughable.