Happy experience parking by field? Quite (8)
I believe the answer is:
pleasure
'happy experience' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'parking by field? quite' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'by' says to put letters next to each other.
'field?' becomes 'lea' (lea can mean a meadow or field of grass).
'quite' becomes 'sure' (I can't justify this - if you can you should believe this answer much more).
'p'+'lea'+'sure'='PLEASURE'
Can you help me to learn more?
(Other definitions for pleasure that I've seen before include "amusement" , "A repulse (anag.)" , "Gratification of the senses" , "'Enjoyment, delight (8)'" , "diversion" .)