It catches fellow removing parking slogan (6)
I believe the answer is:
mantra
'slogan' is the definition.
(I know that mantra is a type of slogan)
'it catches fellow removing parking' is the wordplay.
I cannot quite understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
'fellow' could be 'man' (fellow can mean a man) and 'man' is found within the answer.
The remaining letters 'ra' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mantra that I've seen before include "Incantation, Hindu psalm" , "repeating phrase" , "Sacred text used as incantation" , "Oft-repeated slogan or phrase" , "Chanted phrase" .)