Turn to HQ to find distance between axles (9)
I believe the answer is:
wheelbase
'find distance between axles' is the definition.
I can't tell whether this definition defines the answer.
'turn to hq' is the wordplay.
'turn' becomes 'wheel' (I've seen this before).
'to hq' becomes 'base' (I've seen this before).
'wheel'+'base'='WHEELBASE'
'to' is the link.
Can you help me to learn more?
(Other definitions for wheelbase that I've seen before include "Source of power" , "Length of most of car" .)