At school, youngster useful with a computer (7)
I believe the answer is:
monitor
'a computer' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'at school youngster useful' is the wordplay.
I cannot really see how this works, but
'at' could be 'on' (location) and 'on' is found in the answer.
This explanation may well be incorrect...
'with' acts as a link.
Can you help me to learn more?
(Other definitions for monitor that I've seen before include "record" , "Police" , "Sort of lizard" , "one checks continuously" , "Keep track of" .)