Crossword Genius

Plod along with a letter to Barnaby (6)

Ross

I believe the answer is:

trudge

'plod along' is the definition.
(thesaurus)

'with a letter to barnaby' is the wordplay.
'with' is a charade indicator (letters next to each other).
'a letter' becomes 't' ().
'to barnaby' becomes 'rudge' (barnaby rudge is a dickens novel).
't' put next to 'rudge' is 'TRUDGE'.

(Other definitions for trudge that I've seen before include "Walk with slow, heavy steps" , "Walk wearily" , "Traipse" , "Plod wearily" , "Footslog" .)

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