Uncle Tom's taxi garage? (5)
I believe the answer is:
cabin
'uncle tom's' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'taxi garage?' is the wordplay.
'taxi' becomes 'cab' (synonyms).
'garage?' becomes 'in' (I can't explain this - if you can you should believe this answer much more).
'cab'+'in'='CABIN'
Can you help me to learn more?
(Other definitions for cabin that I've seen before include "Room on board ship" , "Small house (built of logs?)" , "Lodge or hut" , "modest accommodation" , "Small room or hut" .)