Yes, a Dependant’s Pass (DP) holder can work after the employer has received the Letter of Consent (LOC) from the Ministry of Manpower.
Suggested Readings
Can Dependant’s Pass holders who own a company / business firm / LLP apply for a Letter of Consent?
Can I bring in my dependants on an Employment Pass (EP)?
What are the requirements to apply for a Letter of Consent (LOC)?
Do Dependant’s Pass holders with the Letter of Consent need to contribute to any social security or skill development fund, etc.?