Crossword Genius

Bird losing tail, pinned down by wood and stone (6)

Ross

I believe the answer is:

ashlar

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

This might be a double definition.

'bird losing tail pinned down by wood' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'stone' is the second definition.
(I know that ashlar is a type of stone)

'and' acts as a link.

Can you help me to learn more?

(Other definitions for ashlar that I've seen before include "Large square-cut stone" , "wall-facing" , "Rectangular block of hewn stone" , "Dressed stone block" , "building material" .)

I've seen this clue in The Times.
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