Uncle provides transportation for some yams (5)
I believe the answer is:
vanya
'uncle provides transportation' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'some yams' is the wordplay.
I cannot really see how this works, but
'some' could be 'any' (similar in meaning) and 'any' is located in the answer.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for vanya that I've seen before include "Uncle - - (Chekhov)" , "Uncle making dramatic appearance" , "'Uncle --', work of 19" .)