The Terminator for most is the best Arnie film (5)
I believe the answer is:
twins
'best arnie film' is the definition.
I can't tell whether this defines the answer.
'the terminator for most is' is the wordplay.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'terminator for' becomes 'win' (I can't justify this - if you can you should give a lot more credence to this answer).
'most' means to remove the first letter.
'is' with its initial letter removed is 's'.
't'+'win'+'s'='TWINS'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for twins that I've seen before include "Gemini" , "Sign" , "Two offspring born at the same time to the same mother" , "Matching pairs" , "Two born together" .)