Push roughly with large tool (6)
I believe the answer is:
shovel
'tool' is the definition.
(shovel is a kind of tool)
'push roughly with large' is the wordplay.
'push roughly' becomes 'shove' (synonyms).
'with' means one lot of letters go next to another.
'large' becomes 'L' (eg in clothes sizes).
'shove'+'l'='SHOVEL'
(Other definitions for shovel that I've seen before include "Scoop for lifting and carrying" , "Spade with upturned sides" , "Scooper" , "Old clerical hat" , "Tool for snow, coal, etc" .)