There's a lack of variety still (3,3,4)
I believe the answer is:
all the same
'still' is the definition.
(synonyms)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for all the same that I've seen before include "anyway" , "Notwithstanding" , "even so" , "like peas in a pod?" , "Not material" .)