Word: batten
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To become better; improve in condition, especially by feeding.
To feed (on); to revel (in).
To thrive by feeding; grow fat; feed oneself gluttonously.
To thrive, prosper, or live in luxury, especially at the expense of others; fare sumptuously. Example: Robber barons who battened on the poor
To gratify a morbid appetite or craving; gloat.
To improve by feeding; fatten; make fat or cause to thrive due to plenteous feeding.
To fertilize or enrich, as land.
You can find a list of possible crossword clues for BATTEN below.