Struggle when various results are not right (6)
I believe the answer is:
tussle
'struggle' is the definition.
(I know that tussle is a more specific form of the action struggle)
'various results are not right' is the wordplay.
'various' is an anagram indicator.
'are not' indicates named letters should be taken away.
'right' becomes 'r' (common abbreviation).
'results' with 'r' removed is 'esults'.
'esults' with letters rearranged gives 'TUSSLE'.
'when' acts as a link.
(Other definitions for tussle that I've seen before include "Verbal or physical struggle or fight" , "Vigorous struggle or scuffle" , "'Physical fight, struggle (6)'" , "Skirmish" , "Lets us (anag) - fight" .)