Stand experience of drug overdose (6)
I believe the answer is:
'stand' is the definition.
(tripod is a kind of stand)
'experience of drug overdose' is the wordplay.
'experience of drug' becomes 'trip' (as in tripping on drugs).
'overdose' becomes 'o.d.' (synonyms).
(Other definitions for tripod that I've seen before include "oral test at school" , "Three-legged support" , "support called for" , "Something on three legs" , "one appears to have three legs!" .)