Crossword Genius

The Plantagenet era? (3)

Ross

I believe the answer is:

age

I'm a little stuck... Click here to teach me more about this clue!

'era?' is the definition.
(I've seen this before)

'the plantagenet' is the wordplay.
'AGE' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for age that I've seen before include "Era; grow old" , "Very long time" , "Mature, grow in years" , "Just a number" , "Years lived so far" .)

I've seen this clue in the Evening Standard.
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