Survived D. Astle cryptic (6)
I believe the answer is:
lasted
'survived' is the definition.
('last' can be a synonym of 'survive')
'd astle cryptic' is the wordplay.
'cryptic' indicates an anagram (a cryptic or obscure order of the letters).
'd'+'astle'='dastle'
'dastle' is an anagram of 'LASTED'.
(Other definitions for lasted that I've seen before include "Endured, survived" , "Persisted, endured" , "Continued for some time, endured" , "Kept going" , "Continued, being salted" .)