Telegraph supports farm food being wild (7)
I believe the answer is:
haywire
'being wild' is the definition.
(going haywire means going wild)
'telegraph supports farm food' is the wordplay.
'telegraph' becomes 'wire' (synonyms).
'supports' says to put letters next to each other (bottom letters provide a support for the top ones).
'farm food' becomes 'hay' (I've seen this in another clue).
'wire' put after 'hay' is 'HAYWIRE'.
(Other definitions for haywire that I've seen before include "Not working properly" , "All over the shop" , "Chaotic" , "Erratic, out of control" , "Malfunctioning badly" .)