Crossword Genius

Measuring system encountered, endlessly valuable (6)

Ross

I believe the answer is:

metric

'measuring system' is the definition.
(I've seen this before)

'encountered endlessly valuable' is the wordplay.
'encountered' becomes 'met' ('meet' can be a synonym of 'encounter').
'endlessly' means to remove the last letter.
'valuable' becomes 'rich' (similar in meaning).
'rich' with its final letter taken away is 'ric'.
'met'+'ric'='METRIC'

(Other definitions for metric that I've seen before include "Like the SI system" , "Like some feet" , "Quantitative" , "Non-Imperial system of measurement" , "System using litre and gram as units" .)

I've seen this clue in The Times.
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