Spooner Crossword

Spooner confused the initial sounds of words, so he said "You have TASTED two whole WORMS" when he meant "You have WASTED two whole TERMS". In crosswords, Spooner clues mean you have to swap initial sounds over, so "Spooner's to control direction of Hindu's destiny for the British Prime Minister" Control direction + STEER Hindu's destiny = KARMA. Spooner would pronounce STEER KARMA as KEIR STARMER, who's the British Prime Minister, so KEIR STARMER is the answer.