Turn aside and plunge to the right (6)
I believe the answer is:
divert
'turn aside' is the definition.
(I've seen this before)
'plunge to the right' is the wordplay.
'plunge' becomes 'dive' (synonyms).
'to the right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'dive'+'rt'='DIVERT'
'and' acts as a link.
(Other definitions for divert that I've seen before include "Entertain; reallocate" , "Amuse or re-route" , "Send in another direction, or entertain" , "Amuse or send in another direction" , "Turn aside and amuse" .)