A foot problem for a potential tree? (5)
I believe the answer is:
acorn
'potential tree?' is the definition.
(I've seen this in another clue)
'a foot problem for a' is the wordplay.
'a foot problem' becomes 'corn' (I can't justify this - if you can you should believe this answer much more).
'for' says to put letters next to each other (I've seen this in other clues).
'corn' after 'a' is 'ACORN'.
Can you help me to learn more?
(Other definitions for acorn that I've seen before include "Dirt on a liquid surface" , "Potentially future tree" , "Source of a great oak" , "From which a tall tree may grow" , "Baby oak?" .)