Dancing lads with half tutu for grown ups (6)
I believe the answer is:
adults
'grown ups' is the definition.
'dancing lads with half tutu' is the wordplay.
'dancing' indicates an anagram.
'with' means one lot of letters go next to another.
'half' means to take half the letters.
'tutu' halved is 'tu'.
'lads' put after 'tu' is 'tulads'.
'tulads' with letters rearranged gives 'ADULTS'.
'for' acts as a link.
(Other definitions for adults that I've seen before include "Fully grown animals" , "Mature or fully-grown people" , "A-rated film audience" , "Mature creatures" , "Mature animals" .)