a person who undertakes to perform work for another for an amount of time, which may or may not be specified, any person aged 15 years or more, who has entered into or works under a contract with an employer, whether the contract be for manual labour, clerical work or otherwise, whether it be implied or in writing, and whether it be a contract of service or of apprenticeship or a contract personally to execute any work or labour, töölepingu pool, kes kohustub tegema tööandja juhtimisel ja korralduste alusel viimase määratud tööd