Hostile soldier maybe touching one arrested (12)
I believe the answer is:
antipathetic
'hostile' is the definition.
(similar in meaning)
'soldier maybe touching one arrested' is the wordplay.
'soldier' becomes 'ant' (soldier is a type of ant).
'maybe touching' becomes 'pathetic' (I've seen this before. I am not sure about the 'maybe' bit.).
'one' becomes 'i' (Roman numeral).
'arrested' indicates putting letters inside (arrest can mean to hold or imprison).
'ant'+'pathetic'='antpathetic'
'antpathetic' going around 'i' is 'ANTIPATHETIC'.
Can you help me to learn more?
(Another definition for antipathetic that I've seen is " Hateful".)