23 May - Solution for the last clue and the next cryptic crossword clue

Dog entered in popular Manx race is withdrawn (9)

Solution – introvert

An introvert is someone who could be said to be withdrawn as in not outgoing.

Dog = rover

Entered in – means that rover is found in something meaning "popular Manx race"

Popular =  in ie if something is "in" it is popular

Tt = Manx race ie a motor race held on the Isle of Man

So int + rover + t = introvert (tricky one I know)

Today’s cryptic crossword clue – solution tomorrow

Place on border gives undertaking (6)

Hint – the last letter is e