Inform about mare ordering healthy food (6,4)
I believe the answer is:
square meal
'healthy food' is the definition.
'square meal' can be an answer for 'food' (I have seen 'proper food' mean 'square meal' so perhaps 'food' could also mean 'square meal'). I'm not sure about the 'healthy' bit.
'inform about mare ordering' is the wordplay.
'inform' becomes 'squeal' (I can't explain this - if you can you should believe this answer much more).
'about' is an insertion indicator.
'ordering' indicates an anagram.
'mare' is an anagram of 'arem'.
'squeal' going around 'arem' is 'SQUARE MEAL'.
Can you help me to learn more?
(Other definitions for square meal that I've seen before include "Courses" , "Substantial repast" , "proper food" , "apparently not a round of sandwiches?" , "Satisfying food" .)