Grey car's parked in it (7)
I believe the answer is:
neutral
'grey' is the definition.
(thesaurus)
'car's parked in it' is the wordplay.
I cannot really understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
The remaining letters 'neural' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for neutral that I've seen before include "nondescript colour" , "Impartial; plug wire" , "Not allied to either side" , "Disengaged transmission situation" , "Renault (anag.)" .)