Keen tourist, German, given piece of brain and pig's foot (12)
I believe the answer is:
globetrotter
'keen tourist' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'german given piece of brain and pig's foot' is the wordplay.
'german' becomes 'g' (abbreviation).
'given' is a charade indicator (letters next to each other).
'piece of brain' becomes 'lobe' (I can't explain this - if you can you should believe this answer much more).
'and' means one lot of letters go next to another.
'pig's foot' becomes 'trotter' (trotter means a pig's foot eaten as food).
'g'+'lobe'+'trotter'='GLOBETROTTER'
Can you help me to learn more?
(Other definitions for globetrotter that I've seen before include "Well-travelled person" , "One who travels widely" , "Habitual worldwide traveller" , "Wide-ranging traveller" , "seasoned traveller" .)