Estimate (6)
'estimate' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for assess that I've seen before include "(Of a tax) determine the amount to be paid" , "Judge the quality of" , "Remedy for all ills" , "Estimate, gauge" , "Fix the amount of tax" .)
'estimate' is the definition.
(I know that estimate can be written as reckon)
This is the entire clue.
(Other definitions for reckon that I've seen before include "Calculate or conclude" , "what people who count will do" , "Calculate, compute or estimate" , "Consicer or calculate" , "Calculate or opine" .)
'estimate' is the definition.
(I know that guess is a type of estimate)
This is all the clue.
(Other definitions for guess that I've seen before include "Dare say" , "Make stab at" , "Hypothesis" , "Conjecture - estimate" , "Imagine" .)