Piece of granular product obtainable from the moon (5)

I believe the answer is:

lunar

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

'moon' is the definition.

'piece of granular product obtainable from' is the wordplay.
'LUNAR' is hidden backwards within the letters.
But, I'm unsure how the hidden word is indicated.

'the' is the link.

Can you help me to learn more?

(Other definitions for lunar that I've seen before include "Related to the moon" , "that could describe landscape with more than one mare" , "Relating to the moon" , "One sort of month" , "Selenic" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app