Crossword Genius

Rough guess came close and worked out at times (8)

Ross

I believe the answer is:

estimate

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'rough guess' is the definition.
(I've seen this before)

'came close and worked out at times' is the wordplay.
'came close' becomes 'e' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'worked out' indicates an anagram.
'at'+'times'='attimes'
'attimes' is an anagram of 'stimate'.
'e'+'stimate'='ESTIMATE'

Can you help me to learn more?

(Other definitions for estimate that I've seen before include "Judgement of approximate value or size" , "Calculate - valuation" , "Calculate approximately" , "Tease Tim (anag.)" , "Judge the worth of" .)

I've seen this clue in the Sydney Morning Herald.
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