The glory that was Greek (5)
I believe the answer is:
kudos
'the glory' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for kudos that I've seen before include "Laudation" , "Praise and honours" , "Honour - cachet" , "'Credit, honour or prestige (5)'" , "Great prestige" .)