Catch on sale ordered with ire (7)
I believe the answer is:
realise
'catch on' is the definition.
(I've seen this before)
'sale ordered with ire' is the wordplay.
'ordered with' indicates an anagram.
'sale' anagrammed with 'ire' makes 'REALISE'.
(Other definitions for realise that I've seen before include "Come to conclusion" , "Turn into cash; come to see" , "work out" , "Come to know" , "produce" .)