The 6-foot-1, 214-pounder had 93 tackles and one interception last season for the Dolphins.
A former Clemson standout, Clemons has 278 career tackles, 17 pass deflections, four interceptions and two forced fumbles.
The 28-year-old has played five seasons for the Dolphins.
The Lions had in former Atlanta Falcons Pro Bowl free safety Thomas DeCoud for a visit today, but no deal was immediately reached as he completed his visit.
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Aaron Wilson covers the Ravens for The Baltimore Sun