Husband, during trial, not altering a few events (9)
I believe the answer is:
triathlon
'a few events' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'husband during trial not altering' is the wordplay.
'husband' becomes 'h'.
'during' is an insertion indicator.
'altering' is an anagram indicator.
'trial'+'not'='trialnot'
'trialnot' anagrammed gives 'triatlon'.
'h' going inside 'triatlon' is 'TRIATHLON'.
Can you help me to learn more?
(Other definitions for triathlon that I've seen before include "Sporting contest comprising swimming, cycling and running" , "Swimming/cycling/running event" , "Multi-disciplined Olympic event since 2000" , "sports event" , "sporting challenge" .)