Jeer at the score that's curtailed and played very loud (5)
I believe the answer is:
scoff
'jeer at' is the definition.
(thesaurus)
'that's curtailed and played very loud' is the wordplay.
'that's' becomes 'sc' (short for Latin scilicet- 'it follows' or 'that is).
'curtailed' means to remove the last letter.
'and' is a charade indicator (letters next to each other).
'played very' becomes 'co' (I am not sure about this - if you are sure you should believe this answer much more).
'loud' becomes 'ff' (short for fortissimo - 'very loud' in music).
'sc' with its final letter taken off is 's'.
's'+'co'+'ff'='SCOFF'
'the score' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for scoff that I've seen before include "food on offer" , "Furiously swallow" , "Quickly swallow" , "Greedily consume" , "Speak scornfully; eat" .)