Anxious in short time on river (8)
I believe the answer is:
insecure
'anxious' is the definition.
(similar in meaning)
'in short time on river' is the wordplay.
'short time' becomes 'sec' (I am not sure about the 'short' bit.).
'on river' becomes 'ure' (I've seen this in other clues).
'in'+'sec'+'ure'='INSECURE'
Can you help me to learn more?
(Other definitions for insecure that I've seen before include "uncertain" , "Lacking self-confidence or assurance" , "Not firmly fixed" , "Fearful, unsafe." , "safe? Hardly" .)