Stand or fall over a piece of wood (6)
I believe the answer is:
tripod
'stand' is the definition.
(tripod is a kind of stand)
'fall over a piece of wood' is the wordplay.
'fall' becomes 'trip' (as in tripping over).
'over' means one lot of letters go next to another.
'a piece of wood' becomes 'od' (I can't justify this - if you can you should believe this answer much more).
'trip'+'od'='TRIPOD'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for tripod that I've seen before include "Something on three legs" , "Support needed" , "Stand for camera etc" , "Three-legged stand as for camera" , "Torpid (anag.)" .)