Reflective and retiring, keeping at home (5)
I believe the answer is:
shiny
'reflective' is the definition.
(having a reflective surface)
'retiring keeping at home' is the wordplay.
'retiring' becomes 'shy' (I've seen this before).
'keeping' indicates putting letters inside.
'at home' becomes 'in' (similar in meaning).
'shy' going around 'in' is 'SHINY'.
'and' is the link.
(Other definitions for shiny that I've seen before include "Lustrous, glossy" , "Smooth and reflective" , "Polished, reflective" , "Gleaming" , "Smooth and polished" .)