Crossword Genius

Some era — generally a long period (3)

Ross

I believe the answer is:

age

'long period' is the definition.
(I've seen this in another clue)

'some era generally a' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'AGE' is hidden in the letters of 'era generally a'.

(Other definitions for age that I've seen before include "Get older" , "Grow older" , "Years since birth" , "Maturity" , "Length of life" .)

I've seen this clue in The Times.
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