Clue: Having too much on bad for an evil god sacrificing female (11)
Answer: OVERLOADING
Explanation: Definition: Having too much on
*(or an evil god) (The F of "for" is sacrificed.)
 
This surface is a little awkward for my liking. "Having too much on" leads me to an adjective or past participle like "overladen" rather than the answer. Would have preferrred something like "putting too much on"