Push ahead with support - a welfare contribution (6)
I believe the answer is:
propel
'push ahead' is the definition.
(I've seen this in another clue)
'with support a welfare contribution' is the wordplay.
'with' is a charade indicator (letters next to each other).
'support' becomes 'prop' (prop up can mean to support).
'a welfare contribution' becomes 'el' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'prop'+'el' is 'PROPEL'.
Can you help me to learn more?
(Other definitions for propel that I've seen before include "Cause to move forward with force" , "Push forwards" , "Launch" , "Drive or push forward as with oars" , "Give impetus to" .)