Reckon teatime's been altered (8)

I believe the answer is:

estimate

'reckon' is the definition.
(I know that reckon can be written as estimate)

'teatime's been altered' is the wordplay.
'been altered' indicates an anagram.
'teatimes' anagrammed gives 'ESTIMATE'.

(Other definitions for estimate that I've seen before include "Make approximate judgement of size or amount" , "Rough cost" , "Judgement of approximate value or size" , "Approximate calculation" , "calculate aproximately" .)

I've seen this clue in The Irish Independent.

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