Large creatures broke the panels (9)
I believe the answer is:
elephants
'large creatures' is the definition.
'elephants' can be an answer for 'creatures' (elephant is a kind of creature). I'm not sure about the 'large' bit.
'broke the panels' is the wordplay.
'broke' indicates anagramming the letters.
'the'+'panels'='thepanels'
'thepanels' is an anagram of 'ELEPHANTS'.
Can you help me to learn more?
(Other definitions for elephants that I've seen before include "Animals from the palest hen" , "The planes (anag.)" , "Jumbos" , "Five-toed pachyderms" , "big game" .)