Reduced European capital to support work, heading off drilling site (3-3)
I believe the answer is:
oil-rig
'off drilling site' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'reduced european capital to support work heading' is the wordplay.
'reduced' means to remove the last letter.
'european capital' becomes 'riga' (capital of Latvia).
'to support work' becomes 'oil' (I can't justify this - if you can you should believe this answer much more).
'heading' is a charade indicator (letters next to each other) (some letters go in front of or head others).
'riga' with its last letter removed is 'rig'.
'rig' after 'oil' is 'OIL-RIG'.
Can you help me to learn more?