Crossword Genius

Energy put into singular achieve­ment in games — like the Olympics (3-3)

Ross

I believe the answer is:

age-old

'like the olympics' is the definition.
(the Olympics are an ancient competition)

'energy put into singular achievement in games' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'put into' indicates putting letters inside.
'singular' becomes 'a' (both can mean one).
'achievement in games' becomes 'gold' (as in a gold medal in sports).
'a'+'gold'='agold'
'e' going into 'agold' is 'AGE-OLD'.

(Other definitions for age-old that I've seen before include "Hallowed by antiquity" , "Belonging to times long ago" , "Extremely ancient" , "Having existed for a very long time" , "Having been around for many years" .)

I've seen this clue in The Guardian.
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