In favour of exercises before runs? Correct (6)
I believe the answer is:
proper
'correct' is the definition.
('proper' can be similar in meaning to 'correct')
'in favour of exercises before runs?' is the wordplay.
'in favour of' becomes 'pro' (I've seen this before).
'exercises' becomes 'pe'.
'before' means one lot of letters go next to another.
'runs?' becomes 'r' (cricket abbreviation).
'pro'+'pe'+'r'='PROPER'
(Other definitions for proper that I've seen before include "part of Mass" , "Genuine; respectable" , "Befitting" , "Fit; accurate; decent" , "Seemly" .)