Cause new start to season (6)

I believe the answer is:

reason

I'm a little stuck... Click here to teach me more about this clue!

'cause new' is the definition.
'reason' can be an answer for 'cause' (I've seen this before). I'm not certain of the 'new' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for reason that I've seen before include "Sanity, the ability to think" , "Explanation or justification" , "Deduce" , "Justification or motive" , "Logic, sense" .)

I've seen this clue in The Times.

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