Left a runner holding queen's office equipment (5,7)
I believe the answer is:
laser printer
'office equipment' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'left a runner holding queen's' is the wordplay.
I cannot really see how this works, but
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
'a' is present in the answer.
'runner' could be 'r' (abbreviation) and 'r' is found in the answer.
'queen' could be 'er' (short for Elizabeth Regina ie Queen Elizabeth) and 'er' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for laser printer that I've seen is " Computer peripheral".)