Demolishing wings, smash large building stone (6)

I believe the answer is:

ashlar

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

'building stone' is the definition.
(I've seen this in another clue)

'demolishing wings smash large' is the wordplay.
'ASHLAR' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ashlar that I've seen before include "Dressed stone block" , "Building block" , "Rectangular block of cut stone" , "Stone masonry" , "Rectangular block of hewn stone" .)

I've seen this clue in The Telegraph.

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