By going out unaccompanied, creates foolish talk (7)
I believe the answer is:
baloney
'foolish talk' is the definition.
'baloney' can be an answer for 'talk' (I have seen 'deceptive talk' mean 'baloney' so perhaps 'talk' could also mean 'baloney'). I'm not sure about the 'foolish' bit.
'by going out unaccompanied' is the wordplay.
'by going' becomes 'bay' (I can't justify this - if you can you should give a lot more credence to this answer).
'out' means one lot of letters goes inside another.
'unaccompanied' becomes 'lone' (on one's own).
'bay' placed around 'lone' is 'BALONEY'.
'creates' acts as a link.
Can you help me to learn more?
(Other definitions for baloney that I've seen before include "deceptive talk" , "Cobblers" , "Nonsense; lean yob (anag)" , "rhubarb" , "foolish talk!" .)