Puzzle which involves energy, caution and discipline (5,3,4,2)
I believe the answer is:
throw the book at
'discipline' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'puzzle which involves energy caution' is the wordplay.
'puzzle' becomes 'throw' (synonyms).
'which' becomes 'that' ('that' and 'which' are often synonymous).
'involves' is an insertion indicator.
'energy' becomes 'e' (physics symbol as in E=mch).
'caution' becomes 'book' (a footballer receiving a yellow card gets 'booked').
'e'+'book'='ebook'
'that' placed around 'ebook' is 'thebookat'.
'throw'+'thebookat'='THROW THE BOOK AT'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for throw the book at that I've seen before include "Punish severely" , "carpet?" .)