** India's Vodafone Idea VODA.NS tumbles 12.3% to 8.21 rupees, set for third straight session of losses
** Top loser among Nifty 500 .NIFTY500 stocks
** Drops on uncertainty over government relief on adjusted gross revenue dues
** Beleaguered telecom operator's stock hit one-year high of 10.57 rupees on Monday on hopes of a relief after apex court permitted government to reconsider the matter
** "The Supreme Court order applies only to the incremental AGR demand. It depends on the government now. Unless there is a substantial relief, it is not going to make a major difference for Vodafone Idea's stock," says Piyush Pandey, lead analyst tracking the telecom operator at Centrum India
** Analysts on avg rate stock "hold"; median PT at 6.25 rupees, per data from LSEG
** YTD, VODA up 3.4%
(Reporting by Vivek Kumar M)
((VivekKumar.M@thomsonreuters.com;))