The Italian boy's high dives becoming reckless (3-7)
I believe the answer is:
ill-advised
'reckless' is the definition.
(thesaurus)
'the italian boy's high dives' is the wordplay.
'the italian' becomes 'il' ('the' in Italian).
'boy' becomes 'lad' (informal term for boy).
'high' indicates an anagram (like drunk).
'dives' with letters rearranged gives 'vised'.
'il'+'lad'+'vised'='ILL-ADVISED'
'becoming' acts as a link.
(Other definitions for ill-advised that I've seen before include "Imprudent" , "Not prudent" , "Unwise" , "Rash" .)