Duties of Clerical staffs in goverment offices

It depends upon the nature of job of that office. Typically, here are few jobs and responsibilities of clerical staff:-

Monitoring Agency Bill
Pay Bill
Preparing OPRs
Vehicle Bill
Telephone Bill
Electricity Bill
Sweeper Bill
Maintenance of Tender Sale Register
Pension Cases
GPF Loan Sanction
Health Scheme
Proper maintenance of Cash Book
Pay Fixation
Maintaining Audit Files
Leave Sanction
Duplicate Key Register
Issuance Payment Certificates
Service Book Custodian
Service Book Entry of Annual Increment, Leave of Staffs, Nominee of GPF, GI, Death Gratuity etc.
Managing Office Store with Register
Issuance of Identity Card
Preparing Form 16
Earnest Money Taken Out
Remittance of Earnest Money
Maintaining Earnest Money Register
Monthly Accounts
Maintenance of Cash Book
Verifying Cash Balance by DDO at the end of each month
Confirmation of Staffs
Career Advancement Schemes (CAS)
Necessary Arrear Bill
Preparing Gradation List
Appointment on Compassionate Ground
Security Deposit Release
Bill Entry in IFMS
Earnest Money Release
Contractor Ledger
Maintaining IT Register
Bill Register
MB Register
MB Movement Register
GPF Vouchers
Issuance of Income Tax Certificate
Maintaining of File Index
Treasury and Bank related works
BTR
Bill Entry in IFMS

etc.