Possible Clues:

• Part-owner, say
• Actor with an interest to become established in short series
• One with a business interest
• Specialized role at a tent factory?
• Person or organisation with an interest in something
• Threatening adversary for Dracula?
• Pale woman’s fixing familiar person with interest
• Perhaps vampire slayer's assistant who has a real interest
• Person with a particular interest in killing vampires?
• Interested party