Put your hands together to catch balls (8)
I believe the answer is:
claptrap
'balls' is the definition.
(thesaurus)
'put your hands together to catch' is the wordplay.
'put your hands together' becomes 'clap' (I've seen this in another clue).
'to catch' becomes 'trap' (trapping is a kind of catching).
'clap'+'trap'='CLAPTRAP'
(Other definitions for claptrap that I've seen before include "Pretentious talk or nonsense" , "Cobblers" , "Foolish or pretentious talk" , "Stuff and nonsense" , "Pretentious rot" .)