Light fitting in reach stupidly broken by Trotter (10)
I believe the answer is:
chandelier
'light fitting' is the definition.
(I know that chandelier is a type of light fitting)
'in reach stupidly broken by trotter' is the wordplay.
'stupidly' indicates anagramming the letters (a stupid ordering of the letters).
'broken by' indicates putting letters inside (inserted letters break into the word).
'trotter' becomes 'Del' (Delboy Trotter from sitcom Only Fools and Horses).
'in'+'reach'='inreach'
'inreach' with letters rearranged gives 'chanier'.
'chanier' placed around 'del' is 'CHANDELIER'.
(Other definitions for chandelier that I've seen before include "Large hanging light" , "Ornament" , "Hanging light fixture" , "lights up?" , "Candelabrum" .)