Dirge about bank (5)
'bank' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'dirge about' is the wordplay.
'about' is an anagram indicator.
'dirge' with letters rearranged gives 'RIDGE'.
Can you help me to learn more?
(Other definitions for ridge that I've seen before include "Escarpment", "Long narrow crest", "Narrow raised strip or elongated region", "Part of mountain", "Long narrow natural elevation".)