Dickensian character's feeling of resentment, heading off (5)
I believe the answer is:
rudge
'dickensian character's' is the definition.
(I've seen this before)
'feeling of resentment heading off' is the wordplay.
'feeling of resentment' becomes 'grudge' (I've seen this before).
'heading off' means to remove the first letter.
'grudge' with its first letter removed is 'RUDGE'.
(Other definitions for rudge that I've seen before include "Dickens novel 'Barnaby .....'" , "Dickensian halfwit" , "'Barnaby - - ' by Charles Dickens" , "Dickens character" , "Dickensian character" .)