Rough calculation (10)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rough calculation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for estimate that I've seen before include "Gauge - approximation" , "Make an educated guess" , "rough judgment" , "Calculate approximately" , "damage" .)
(Other definitions for estimation that I've seen before include "Judgment" , "Guess" , "View" , "Reckoning of value" , "Opinion" .)