On radio I will take point about limitations of crucial gym item (10)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

INDIA (I in the radio alphabet = “on radio I”) + NUB (point = central and most important thing, as in “the nub of the argument”), around the outer letters (limitations) of C [rucia] L . Weighted wooden club (originally from India and/or ancient Persia) used as exercise equipment, normally in pairs.