Raise some more arguments (4)
I believe the answer is:
rear
'raise' is the definition.
(rearing is a kind of raising)
'some more arguments' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'REAR' is hidden within 'more arguments'.
(Other definitions for rear that I've seen before include "Bottom" , "Hindmost part" , "Back; bring up (young)" , "Jump" , "what you may bring up" .)