Worked until I got to the forefront (6)
I believe the answer is:
toiled
'worked' is the definition.
(toiling is a kind of working)
'until i got to the forefront' is the wordplay.
'until' becomes 'to' (I've seen this in other clues).
'got' is a charade indicator (letters next to each other).
'to the forefront' becomes 'led' (I can't justify this - if you can you should give a lot more credence to this answer).
'to'+'i'+'led'='TOILED'
Can you help me to learn more?
(Other definitions for toiled that I've seen before include "Laboued long and hard" , "Worked or laboured very hard" , "Worked long and hard" , "Worked incessantly" , "Worked laboriously and long" .)