26 Heathen - Heath is the premier, en is the space (a printing term). The extra letter is in 'boron' .
Johnalex, there was an extra letter in the definition part of the clues and the remainder was scrambled. I think the 'c' in 'camel was superfluous - and unscrambling gave 'male' - Howard. (This could be wrong, I'm doing it from memory.)