Short piece, that’s standard on course (3)
I believe the answer is:
par
'standard on course' is the definition.
'par' can be an answer for 'standard' (standard of play in golf). I also know that 'course' relates to this answer.
'short piece' is the wordplay.
'short' means to remove the last letter.
'piece' becomes 'part' (synonyms).
'part' with its final letter removed is 'PAR'.
'that's' is the link.
Can you help me to learn more?
(Other definitions for par that I've seen before include "Target score (golf)" , "Average - equality" , "Standard number of strokes for a golf-hole" , "Accepted standard" , "Usual or expected level" .)