Provide a couple of bits of variety (4)
I believe the answer is:
vary
'provide' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for vary that I've seen before include "Fluctuate" , "Differ, alter" , "Differ from a standard" , "Change form or state" , "Diversify" .)