Watch the Bendy Three online guitar lesson by Jon Finn from 30 Melodic Modal Rock Licks You MUST Know
"Bendy Three" starts on the 3rd of the D chord (F#) and ends on the same note. Plus, that note is featured a few times over the course of the phrase. The rest of it focuses on creating a strong Mixolydian (major scale with b7) sound.
Check the notation and tablature to get the finer details. Practice with the backing track, then invent your own version of this lick!