Neglect to order it (4)
I believe the answer is:
omit
'neglect' is the definition.
(synonyms)
'order it' is the wordplay.
'order' becomes 'om' (Order of Merit).
'om'+'it'='OMIT'
'to' is the link.
(Other definitions for omit that I've seen before include "Leave out or forget" , "Leave out or neglect" , "Neglect to include" , "Leave out, perhaps in error" , "Fail to use" .)