Suddenly turn to render assistance, grabbing wife (6)
I believe the answer is:
swerve
'suddenly turn' is the definition.
'swerve' can be an answer for 'turn' (swerving is a kind of turning). I am not certain of the 'suddenly' bit.
'render assistance grabbing wife' is the wordplay.
'render assistance' becomes 'serve' (I can't explain this - if you can you should give a lot more credence to this answer).
'grabbing' means one lot of letters goes inside another.
'wife' becomes 'w'.
'serve' going around 'w' is 'SWERVE'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for swerve that I've seen before include "Turn sharply aside" , "Change course suddenly" , "Change course abruptly" , "Turn suddenly aside from a straight course" , "try to avoid" .)