Beginning old equipment at home (6)
I believe the answer is:
origin
'beginning' is the definition.
(origin is a kind of beginning)
'old equipment at home' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'equipment' becomes 'rig' (rig is a kind of equipment).
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'o'+'rig'+'in'='ORIGIN'
(Other definitions for origin that I've seen before include "Where one begins" , "First thing" , "Source, root" , "Place where something begins" , "Genesis" .)