Looks, say, for coal deposits (5)
I believe the answer is:
seams
This clue could be a double definition.
'looks' is the first definition.
Although both the answer and definition are verbs in their -s form, I don't see how one could define the other.
'for coal deposits' is the second definition.
(I've seen this in another clue)
'say' is the link.
Can you help me to learn more?
(Other definitions for seams that I've seen before include "Sewn joins" , "Joints" , "Strata of minerals" , "Strata of ore or coal suitable for mining" .)