serve as a/(one's) substitute

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serve as a/(one's) substitute

To take the place or fill the purpose of someone or something else. We created these wood pellets from repurposed sawdust to serve as more a ecologically friendly substitute for other fuel sources. This is Shawna, everyone. She's going to be serving as my substitute while I'm on sabbatical.
See also: serve, substitute
References in periodicals archive ?
If the community accepted, for the most part, men who hired substitutes, it did not have the same attachment to men who served as substitutes. Generally, substitutes in Rockingham lacked a connection to the community.
Interns served as substitutes in a variety of English classes reflecting diverse learning styles and, as a result, grew as professionals.