Information about catalogue showing sparkle (7)
I believe the answer is:
glisten
'sparkle' is the definition.
(I know that sparkle can be written as glisten)
'information about catalogue' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'about' is an insertion indicator.
'catalogue' becomes 'list' (a catalogue is a list of items).
'gen' enclosing 'list' is 'GLISTEN'.
'showing' is the link.
(Other definitions for glisten that I've seen before include "look bright" , "Glow from reflection" , "Shine with reflected light" , "'Shine, as if wet (7)'" , "Singlet (anag.); tingles (anag.)" .)