Most charming setter with tip: move the letters around (9)
I believe the answer is:
prettiest
'most charming' is the definition.
(I've seen this before)
'setter with tip move the letters around' is the wordplay.
I cannot really see how this works, but
'setter' could be 'i' (the person who set this crossword) and 'i' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'letters' could be 'es' (more than one E) and 'es' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for prettiest that I've seen before include "Most charming" , "Most attractive" , "Most beautiful" .)