Sorry! That should have been 'take away the first four letters' at 23A.
So, you have a blank square (to be filled by a number), then CH. Then, a three letter word to complete the answer.
Nelson, or anyone brighter than me, I am enjoying this so much but cannot see my way round 39a or 17d. I have dra?d for 39 and ?ea?de??? For 17. Am I wrong?
39A , definition is 'local hussy'.
Take an old word for prostitute and put it round a word meaning to inform and an abbreviation for chinese.
This gives a nine letter word.
But, there is a clash at the end, so you only enter the first four letters.