Clean-cut boys rebuilt blown-up fortress? (6,6)
I believe the answer is:
bouncy castle
'blown-up fortress?' is the definition.
(I've seen this before)
'clean-cut boys rebuilt' is the wordplay.
'clean cut' becomes 'cleancut' (synonyms).
'rebuilt' is an anagram indicator.
'cleancut'+'boys'='cleancutboys'
'cleancutboys' with letters rearranged gives 'BOUNCY CASTLE'.
(Other definitions for bouncy castle that I've seen before include "Inflatable device at fetes etc" , "Inflatable fort for children's play" , "Inflated fortress for kids" , "[ENTERTAINMENT] loved by children" , "Inflatable play area" .)