Start old equipment at home (6)
I believe the answer is:
origin
'start' is the definition.
(I've seen this in another clue)
'old equipment at home' is the wordplay.
'old' becomes 'o' (abbreviation).
'equipment' becomes 'rig' (rig is a kind of equipment).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'o'+'rig'+'in'='ORIGIN'
(Other definitions for origin that I've seen before include "Source, root" , "Beginning, starting point" , "Place where something begins" , "Source, beginning point" , "Where one begins" .)