** Morningstar trims fair value estimate for MetcashMTS.AX by 7% to A$3.80
** Research firm trims valuation for wholesaler largely due to lower supermarket sales, which account for a third of the company's operating earnings
** Morningstar adds that grocers supplied by co are underperforming major chains
** Morningstar also sees less liquor sales, says younger people drinking less
** For tobacco, Morningstar sees illicit sales and long-term trend of less smoking hitting sales
** 6 of 12 analysts rate stock "buy" or higher on stock; the remaining half recommend "hold", LSEG-compiled data shows
** YTD, MTS shares are down 9.1%
(Reporting by Nichiket Sunil in Bengaluru)
((Nichiket.Sunil@thomsonreuters.com))