It's fated, all the time children will ask 'are we nearly there yet? (14)
I believe the answer is:
predestination
'it's fated all' is the definition.
I can't tell whether this definition defines the answer.
'time children will ask 'are we nearly there yet?' is the wordplay.
I cannot really see how this works, but
'time' could be 'est' (EST is an example) and 'est' is located in the answer.
'ask' could be 'o' and 'o' is located in the answer.
''are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'the' acts as a link.
Can you help me to learn more?
(Other definitions for predestination that I've seen before include "Calvinist doctrine" , "Fixed fate" , "Doctrine that God has ordained future events" .)