Mumbai, Aug. 23 -- Indian markets fell for a third straight day on Tuesday, amid weak global cues, lack of clarity over taxation of foreign portfolio investors (FPIs) and the prolonged wait for a fiscal stimulus. Analysts said comments made by some government officials have dimmed hopes of any substantial stimulus package. The BSE Sensex fell 587.44 points, or 1.59%, to 36,472.93, while the Nifty shed 1.62% to 10,741.35....