Is is me, or is 6D a bit of a trick? A four letter word, O-U- should not be a challenge to a crossword fan like me! Am I the only one, or is this like the elephant in the room?
Any great minds out there who have specialist understanding of parts of speech would be a great correspondent....
Oh many thanks Sandyroe; I have evaporation for 1A, and of course the second O is the culprit, which makes two of us. Thanks to Ubasses (as well) for pointing out that it should be "evaporating". Looking at the wording of the clue, perhaps evaporation would have been correct if the clue had started "...the act of turning a liquid..."
Doh.