Ideas people have even so on a back street (8)
I believe the answer is:
thoughts
'ideas' is the definition.
(I know this)
'so on a back street' is the wordplay.
'so on' becomes 'though' (I can't explain this - if you can you should believe this answer much more).
'a back' is a reversal indicator.
'street' becomes 'st' (abbreviation).
'st' back-to-front is 'ts'.
'though'+'ts'='THOUGHTS'
'people have even' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for thoughts that I've seen before include "Ideas, reflections" , "Notions" , "They are in my mind" , "Ideas, musings" , "Cogitations" .)