Clear standard breached by training policy proposals by government (5,5)
I believe the answer is:
white paper
'policy proposals by government' is the definition.
(a white paper is a set of government proposals)
'clear standard breached by training' is the wordplay.
'clear' becomes 'white' ().
'standard' becomes 'par' (standard of play in golf).
'breached by' means one lot of letters goes inside another (inserted letters break into or breach the word).
'training' becomes 'PE' (Physical Education).
'par' placed around 'pe' is 'paper'.
'white'+'paper'='WHITE PAPER'
(Other definitions for white paper that I've seen before include "policy proposal" , "Government plan" , "Official publication" , "Not the FT!" , "Political document" .)