Lamps switch at closing time, for instance (6)
I believe the answer is:
sample
'instance' is the definition.
(I know that sample is a type of instance)
'lamps switch at closing time' is the wordplay.
'switch' is an anagram indicator.
'at' means one lot of letters go next to another.
'closing time' becomes 'e' (I can't explain this - if you can you should believe this answer much more).
'lamps' anagrammed gives 'sampl'.
'sampl'+'e'='SAMPLE'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for sample that I've seen before include "Test the specimen" , "Taste(r)" , "Experience" , "Drop of" , "A specimen of maples" .)