I'd recommend snatching a baby for your first elderclaw. Taming one the "legit" way involves killing an adult, planting the seed it drops in a greenhouse, feeding it crazy things like biotoxin and ammonite bile, then raising the hatched cub like a regular baby. The reason I recommend stealing a baby for your first tame is because an adult Elderclaw can spawn in the six different craved foods of the seed version via its corpse blossom ability.