I would say the answer has to be MINER, otherwise, where does the 'Worker' come in. Personally I would be happier with it if there was a question-mark at the end.
ie
. Worker // for Pitt the Younger?
If the answer is MINOR, then you wold have to split it the other way as
. Worker for Pitt // the Younger
and in that case the 'Pitt' would have the wrong spelling.