Puzzle which involves energy, caution and discipline (5,3,4,2)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

THROW (puzzle) THAT (which) around E (energy) BOOK (caution) I didn’t know BOOK = ‘caution’, which is a sports verb meaning to write a player’s name down to warn them for bad behavior. But I was able to get this from the enumeration once I had some letters in.