An entrance's variegated stones (6)

I believe the answer is:

agates

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'variegated stones' is the definition.
'agates' can be an answer for 'stones' (I've seen this before). I am unsure of the 'variegated' bit.

'an entrance's' is the wordplay.
'an' becomes 'a'.
'entrance's' becomes 'gates'.
'a'+'gates'='AGATES'

Can you help me to learn more?

(Other definitions for agates that I've seen before include "Set aga up for shiny stones" , "Chalcedonies" , "Name for stones" , "Multi-coloured quartzes" , "Pieces of impure quartz used as gemstones" .)

I've seen this clue in The Times.

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