Crossword Genius

Regularly stained construction material (4)

Ross

I believe the answer is:

sand

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

'construction material' is the definition.
'sand' can be an answer for 'material' (sand is a kind of material). I'm not sure about the 'construction' bit.

'regularly stained' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'stained' are 'SAND'.

Can you help me to learn more?

(Other definitions for sand that I've seen before include "Beach grit" , "Yellow-brown colour" , "Dune constituent" , "yellowish-brown" , "Desert material" .)

I've seen this clue in The Hindu.
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