Response, in short, includes false statement regarding strangers (6)
I believe the answer is:
aliens
'regarding strangers' is the definition.
'aliens' can be an answer for 'strangers' ('alien' can be a synonym of 'stranger'). I am not certain of the 'regarding' bit.
'response in short includes false statement' is the wordplay.
'response in short' becomes 'ans' (I've seen this in another clue).
'includes' is an insertion indicator.
'false statement' becomes 'lie' (lie is a kind of false statement).
'ans' enclosing 'lie' is 'ALIENS'.
Can you help me to learn more?
(Other definitions for aliens that I've seen before include "Strange forms of life" , "Foreigners or creatures from outer space" , "'Little green men'?" , "Outsiders" , "Forms of life assumed to exist outside Earth" .)