Choose detailed books on decorative embroidery (5)
I believe the answer is:
picot
'decorative embroidery' is the definition.
(thread design decorating fabric)
'choose detailed books' is the wordplay.
'choose' becomes 'pick' (picking is a kind of choosing).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'books' becomes 'ot' (abbreviation for Old Testament).
'pick' with its last letter removed is 'pic'.
'pic'+'ot'='PICOT'
'on' is the link.
(Other definitions for picot that I've seen before include "Lace pattern of hoops" , "Looped edging" , "ornament" , "Small lace edging loop" , "Small embroidery loop" .)