Marshawn Lynch is staying busy off the football field ... the former NFL running back was just spotted in the visuals for rapper Ian's new single!!
The music video for the "Figure It Out" track was released on Monday ... and Lynch -- who played 12 seasons in the NFL before hanging up his cleats -- was shown within the first 30 seconds.
Throughout the project, the 38-year-old drives a red pickup around a junkyard in Canada .