Discus half completed - right before shot put upset (7)
I believe the answer is:
disrupt
'upset' is the definition.
(I've seen this in another clue)
'discus half completed right before shot put' is the wordplay.
'half' suggests halving the letters.
'completed right' becomes 'r' (common abbreviation. I am not sure about the 'completed' bit.).
'before' says to put letters next to each other.
'shot' indicates an anagram.
'discus' with half the letters taken is 'dis'.
'put' anagrammed gives 'upt'.
'dis'+'r'+'upt'='DISRUPT'
Can you help me to learn more?
(Other definitions for disrupt that I've seen before include "Throw into disorder" , "Break up" , "Interrupt and spoil" , "Disturb" .)