Agricultural tool with hard shaft (6)
I believe the answer is:
harrow
'agricultural tool' is the definition.
'with hard shaft' is the wordplay.
'with' says to put letters next to each other.
'hard' becomes 'h'.
'shaft' becomes 'arrow' (I've seen this before**).
'h'+'arrow' is 'HARROW'.
(Other definitions for harrow that I've seen before include "Equipment provided for ground-breaking" , "Spiked frame for breaking and levelling soil" , "Till" , "Agricultural frame for breaking up soil" , "Cultivator that pulverizes or smooths soil" .)