Rachel, robbed of her new car at the park, needs this (4)
I believe the answer is:
help
'rachel robbed of her new car at the park needs this' is the definition.
The definition suggests a singular noun which matches the answer.
'park needs this' is the wordplay.
I cannot quite understand how this works, but
'park' could be 'p' (abbreviation as on an automatic car's gear lever) and 'p' is found within the answer.
The remaining letters 'hel' 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 help that I've seen before include "Assist, aid" , "Succour" , "Contribute to the success of" , "Come to the aid of" , "one by the Beatles" .)