Thoughtless advice to those who are too anxious? (8)
I believe the answer is:
careless
'thoughtless' is the definition.
(similar in meaning)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for careless that I've seen before include "Marked by lack of attention" , "Inconsiderate" , "Inattentive - nonchalant" , "Lackadaisical" , "Inattentive to risk" .)