To change gear going round a bend, can be boring (5)
I believe the answer is:
auger
'can be boring' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'to change gear going round a bend' is the wordplay.
'to change' is an anagram indicator.
'going round' is an insertion indicator (some letters go around others).
'a bend' becomes 'U' (a U-bend is a kind of bend - pipe under sink).
'gear' with letters rearranged gives 'ager'.
'ager' going around 'u' is 'AUGER'.
Can you help me to learn more?
(Other definitions for auger that I've seen before include "A drilling tool" , "A tool for boring hole in wood" , "I bore" , "Boring instrument" , "Tool for boring holes in wood" .)