Impractical to leave California without a justifying reason (7)
I believe the answer is:
useless
'impractical' is the definition.
(thesaurus)
'leave california without a justifying reason' is the wordplay.
I cannot quite see how this works, but
'without' could be 'less' (I've seen this in another clue) and 'less' is found in the answer.
The remaining letters 'use' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for useless that I've seen before include "Futile and unavailing" , "Far from impressive" , "Is Sue less impractical?" , "Good for nothing" , "Having no beneficial function" .)