Did suit check, even by itself? (7)
I believe the answer is:
squared
'did' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for squared that I've seen before include "Brought into accord" , "Agreed" , "Reconciled < , or bribed" , "Multiplied by itself" , "As four is to make 16" .)