Alterations as to fodder (4)
I believe the answer is:
oats
'fodder' is the definition.
(I've seen this in another clue)
'alterations as to' is the wordplay.
'as to' anagrams to 'OATS'.
But, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for oats that I've seen before include "Seed grasses" , "Young men sow wild ones" , "Grains used as food and fodder" , "Porridge ingredients" , "Porridge ingredient" .)