It's used in tiling, routinely (5)

I believe the answer is:

grout

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'it's' is the definition.
I can't tell whether this definition defines the answer.

'in tiling routinely' is the wordplay.
'in' says the answer is hidden in the clue.
'GROUT' is hidden in the letters of 'tiling routinely'.

'used' is the link.

Can you help me to learn more?

(Other definitions for grout that I've seen before include "Grub" , "Tile mortar" , "Tile fixer" , "Filling for joints between tiles" , "Mortar for tiling" .)

I've seen this clue in the Evening Standard.

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