Support the Spanish drive forward (6)
I believe the answer is:
propel
'drive forward' is the definition.
(I've seen this before)
'support the spanish' is the wordplay.
'support' becomes 'prop' (prop up can mean to support).
'the spanish' becomes 'el' ('the' in Spanish).
'prop'+'el'='PROPEL'
(Other definitions for propel that I've seen before include "Push forwards" , "Drive or push forward as with oars" , "Launch" , "Cause to move forward with force" , "Drive forwards" .)