Decoration or title book (8)

I believe the answer is:

ornament

'decoration' is the definition.
(I've seen this before)

'or title book' is the wordplay.
'title' becomes 'name' (I've seen this before).
'book' becomes 'nt' (I've seen this in other clues).
'or'+'name'+'nt'='ORNAMENT'

(Other definitions for ornament that I've seen before include "Trim" , "Decorative item" , "Trinket - decoration" , "trill?" , "composers can provide in a shake" .)

I've seen this clue in The Telegraph.

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