Dressing putting on bit of glamour and sparkle (5)
I believe the answer is:
glint
'sparkle' is the definition.
(thesaurus)
'dressing putting on bit of glamour' is the wordplay.
'dressing' becomes 'lint' (I've seen this before**).
'putting on' means one lot of letters go next to another.
'bit of' says to take the initial letters.
The first letter of 'glamour' is 'g'.
'lint' after 'g' is 'GLINT'.
'and' is the link.
(Other definitions for glint that I've seen before include "Small flash of light" , "Flicker of light" , "Brief indication" , "Flash of light (in the eye?)" , "Flash of reflected light" .)