As careless riverside walker did maybe: one Italian director (7)
I believe the answer is:
fellini
'one italian director' is the definition.
(Federico Fellini, 1920-1993)
'as careless riverside walker did maybe' is the wordplay.
I cannot really understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
'maybe' could be 'i' (I've seen this in other clues) and 'i' is found within the answer.
The remaining letters 'fell' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
(Other definitions for fellini that I've seen before include "Shooting Italian" , "Federico ------- (1920-1993), Italian film director" , "It. director of Satyricon" , "Federico --, Italian film producer" , "Italian film-maker, d. 1993" .)