Bobby still with fellow also going north (8)
I believe the answer is:
flatfoot
'bobby' is the definition.
(thesaurus)
'still with fellow also going north' is the wordplay.
'still with' becomes 'flat' (I can't explain this - if you can you should give a lot more credence to this answer).
'fellow' becomes 'F' (abbreviation - of a society etc.).
'also' becomes 'too' (synonyms).
'going north' is a reversal indicator.
'too' in reverse letter order is 'oot'.
'flat'+'f'+'oot'='FLATFOOT'
Can you help me to learn more?
(Other definitions for flatfoot that I've seen before include "One used to beat" , "Old policeman on the beat - tough walking" , "old copper" .)