Nervous about home shown by glossy (5)
I believe the answer is:
shiny
'glossy' is the definition.
('shiny' can be a synonym of 'glossy')
'nervous about home' is the wordplay.
'nervous' becomes 'shy' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'home' becomes 'in' ('he's home' can mean 'he's in').
'shy' enclosing 'in' is 'SHINY'.
'shown by' is the link.
(Other definitions for shiny that I've seen before include "Bright" , "Gleaming" , "Polished and reflecting light" , "Lustrous, glossy" , "Polished, reflective" .)