Blue pigment provided by fellow Lithuanian, perhaps (6)
I believe the answer is:
cobalt
'blue pigment' is the definition.
(I've seen this before)
'fellow lithuanian perhaps' is the wordplay.
I cannot quite understand how this works, but
'fellow' could be 'co' (eg a co-worker is a fellow worker) and 'co' is present in the answer.
'lithuanian' could be 'balt' (I've seen this in another clue) and 'balt' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'provided by' is the link.
Can you help me to learn more?
(Other definitions for cobalt that I've seen before include "A deep-blue colour (6)" , "Magnetic-alloy element; a blue" , "Bright blue pigment" , "Metallic element used in blue/green pigments" , "Metallic element, Co" .)