Let me explain plan B: pretend everything's OK (4,3,5,3)
I believe the answer is:
look the other way
'let' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how they can define each other.
'me explain plan b pretend everything's ok' is the wordplay.
I cannot quite see how this works, but
'ok' could be 'ay' (archaic alternative to 'yes') and 'ay' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for look the other way that I've seen before include "Wink at something" , "turn a blind eye" , "Take no notice" , "have alternative appearance?" .)