Result still adrift, ultimately (5)
I believe the answer is:
event
'result' is the definition.
(I've seen this before)
'still adrift ultimately' is the wordplay.
'still' becomes 'even' (synonyms).
'ultimately' suggests the final letters.
The last letter of 'adrift' is 't'.
'even'+'t'='EVENT'
(Other definitions for event that I've seen before include "Anything which happens" , "important" , "Happening, noteworthy perhaps" , "Significant happening" , "long jump, say" .)