Accumulate runs quickly to secure victory on time (7)
I believe the answer is:
harvest
'accumulate runs' is the definition.
'harvest' can be an answer for 'accumulate' (thesaurus). I'm not sure about the 'runs' bit.
'quickly to secure victory on time' is the wordplay.
'quickly' becomes 'hares' (I can't explain this - if you can you should give a lot more credence to this answer).
'to secure' indicates putting letters inside.
'victory' becomes 'v'.
'on' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'hares' going around 'v' is 'harves'.
'harves'+'t'='HARVEST'
Can you help me to learn more?
(Other definitions for harvest that I've seen before include "Gather in (a crop)" , "A season's yield, crop" , "Bring in the corn etc" , "reap rewards" , "Produce" .)