Stand to succeed finally after lapse (6)
I believe the answer is:
tripod
'stand' is the definition.
(tripod is a kind of stand)
'to succeed finally after lapse' is the wordplay.
'finally' indicates one should take the final letters.
'after' means one lot of letters go next to another.
'lapse' becomes 'trip' (both can mean a fall).
The last letters of 'to succeed' are 'od'.
'od' put after 'trip' is 'TRIPOD'.
(Other definitions for tripod that I've seen before include "Support needed" , "Three-legged support" , "oral test at school" , "Drop it (anag)" , "support called for" .)