In my party the clerics are being geared towards being meatgrinders, what spells will help them do that? Right now the only spell of use that I have is Armor of Faith.

Bull's Strength is always good.
Aid is very useful at lower levels.
Any of the ones that provide immunity to spells like Hold Person, Charm Person, Fear etc which render your meatgrinders helpless are pretty essential
Draw on Holy Might (if your cleric is in the frontline too)
Healing spells (although you can spontaneously cast them anyway so as long as your cleric isn't evil)

Holy Power for a good damage boost.
Divine Shell for +6 deflection AC.
Prayer and Recitation make you more effective and the enemy weaker at the same time - great spells.
Champion's Strength for even greater strength than Bull's Strength provides.

Exaltation and chaotic commands are the main negative status protectors.
Any spell that keeps the enemy confused or disabled(Bane is good for this).
Don't forget your domain spells. Cleric of Helm has some extra defensive arcane spells like aegis.
Do you have arcane casters in your party and want all spell advice or just cleric spells?

There's a file on gamefaqs.com that lists all clerical (and druidic, in case you want to look at those too) spells, by domain. Since which deity you pick influences your spell selection, and some in fact get arcane spells (including some self-cast only spells), you might want to have a look at it (if you haven't already).