Garden tool he carried round (3)
I believe the answer is:
hoe
'garden tool' is the definition.
(tool used when gardening)
'he carried round' is the wordplay.
'carried' is an insertion indicator.
'round' becomes 'o' (round can mean a round object).
'he' enclosing 'o' is 'HOE'.
(Other definitions for hoe that I've seen before include "Garden tool with a flat blade" , "Garden tool for scraping up weeds" , "Weeder" , "Garden implement" , "Purple gem" .)