Root bats, getting runs, but this one turns (5)
I believe the answer is:
rotor
'this one turns' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'root bats getting runs' is the wordplay.
'bats' is an anagram indicator (slang for mad).
'getting' indicates putting letters inside.
'runs' becomes 'r' (cricket abbreviation).
'root' with letters rearranged gives 'otor'.
'otor' placed around 'r' is 'ROTOR'.
'but' is the link.
Can you help me to learn more?
(Other definitions for rotor that I've seen before include "Revolving part of machinery" , "Copter blade assembly" , "Turning part of a mechanism" , "It goes round and round (and back and forth)" , "Part of, eg, a motor" .)