Vanessa from Madrid surprisingly encased in concrete (3,7)

I believe the answer is:

red admiral

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

'from madrid surprisingly encased in concrete' is the wordplay.
'from' becomes 'e' (I've seen this in other clues).
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'encased in concrete' becomes 'ral' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'e'+'madrid'='emadrid'
'emadrid' is an anagram of 'redadmi'.
'redadmi'+'ral'='RED ADMIRAL'

Can you help me to learn more?

(Other definitions for red admiral that I've seen before include "Tiny flier" , "Beautiful creature" , "Common butterfly" , "Vanessa" , "Russian sailor" .)

I've seen this clue in The Telegraph.

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