Accepted standards of sportsman ignoring past (5)
I believe the answer is:
norms
'accepted standards' is the definition.
'norms' can be an answer for 'standards' (norm is a kind of standard). I am not certain of the 'accepted' bit.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for norms that I've seen before include "Standards, customs of behaviour" , "Typical patterns or situations" , "They're usual or standard" , "Representative standards as of behaviour" , "Authorative standards" .)