Write piece about one Batman foe (7)
I believe the answer is:
penguin
'batman foe' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'write piece about one' is the wordplay.
I cannot really see how this works, but
'write' could be 'pen' (synonyms) and 'pen' is located in the answer.
'piece' could be 'n' (abbreviation for Knight in chess notation) and 'n' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
The remaining letters 'gu' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for penguin that I've seen before include "Black-and-white antarctic bird" , "Flightless seabird" , "swimmer" , "Swimming bird" , "Waddling bird" .)