Bonding agent (6)

I think it could be either:

Which length description are you looking for?:

cement

'bonding agent' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for cement that I've seen before include "Bind firmly" , "Firmly establish" , "bind together" , "Bind (friendship)" , "Powder used to make concrete" .)

I've seen this clue in The Times.

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