The Indus Dictionary Project
In this pictograph, an adult person works on the body of a cart, which sits on the ground. Therefore, it is the noun wainwright.
Harappa: Seal: H-513 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 286: Collections in Pakistan: Suomalainen Tiedeakatemia.
In inscription H-513, the base of the cart body is almost level with the bottom of the person's feet.
Indus Script Sign Number 2264: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.