This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who grips a hanging strap or similar device for support while riding as a passenger on a bus or subway.

n. One who uses public transportation.

n. A person who travels using public transportation (often standing up and holding on to a strap).

n. a standing subway or bus passenger who grips a hanging strap for support

n. a commuter who uses public transportation

"The video, which went viral Monday, was captured by a straphanger Friday at the 181st Street Station in Washington Heights."

passenger    rider    commuter