Enlarge in order to make broad (7)
I believe the answer is:
general
'broad' is the definition.
(similar in meaning)
'enlarge in order' is the wordplay.
'in order' is an anagram indicator (the letters in a new order).
'enlarge' is an anagram of 'GENERAL'.
'to make' is the link.
(Other definitions for general that I've seen before include "Regular - officer" , "Not specialised, rank" , "Applying to all or most of a group" , "Not specialised or limited" , "Enlarge (anag.)" .)