Uncultured boy coming first in English (10)
I believe the answer is:
philistine
'uncultured' is the definition.
(thesaurus)
'boy coming first in english' is the wordplay.
'boy coming' becomes 'phil' (I can't explain this - if you can you should give a lot more credence to this answer).
'first' becomes 'ist' (ist resembles pst).
'english' becomes 'E' (abbreviation).
'phil'+'ist'+'in'+'e'='PHILISTINE'
Can you help me to learn more?
(Other definitions for philistine that I've seen before include "One indifferent to culture" , "Tasteless" , "one who's lowbrow?" , "One hostile to culture" , "Someone indifferent to culture and the arts" .)