Stelluti keeps this material back (5)

I believe the answer is:

tulle

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

'this material back' is the definition.
'tulle' can be an answer for 'material' (tulle is a kind of material). I am not certain of the remainder of the definition.

'stelluti' is the wordplay.
'TULLE' is hidden backwards within the letters.
However, I'm uncertain how this is indicated.

'keeps' is the link.

Can you help me to learn more?

(Other definitions for tulle that I've seen before include "Silk net fabric" , "What veils the bride" , "French town" , "that may be around one's body" , "Tutu netting" .)

I've seen this clue in The Sun.

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