Predictable blow, traffic having to twist and turn (5,4)
I believe the answer is:
trade wind
'predictable blow' is the definition.
'trade wind' can be an answer for 'blow'. I'm unsure of the 'predictable' bit.
'traffic having to twist and turn' is the wordplay.
I cannot quite see how this works, but
'traffic' could be 'trade' (traffic can mean illegal trade) and 'trade' is found within the answer.
'twist' could be 'wind' (synonyms) and 'wind' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for trade wind that I've seen before include "Flow of air" , "Current" , "shipowners once relied on" , "Steady breeze towards the equator" .)