Origins of garage and parking space (3)
I believe the answer is:
gap
'space' is the definition.
(I know that gap is a type of space)
'origins of garage and parking' is the wordplay.
'origins of' says to take the initial letters.
The first letters of 'garage and parking' is 'GAP'.
(Other definitions for gap that I've seen before include "Narrow space" , "A small parting, in hedge or teeth" , "Break, in a fence say" , "Break, hole, space" , "A break or opening as in a hedge" .)