Crossword Genius

Good, free crossword? (4)

Ross

I believe the answer is:

grid

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'crossword?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'good free' is the wordplay.
'good' becomes 'g' (abbreviation).
'free' becomes 'rid' ('rid' can be a synonym of 'free'**).
'g'+'rid'='GRID'

Can you help me to learn more?

(Other definitions for grid that I've seen before include "Network of crossing parallel lines" , "Rectangular lattice" , "Lattice, mesh" , "Regular pattern of horizontal and vertical lines" , "Grating of parallel bars" .)

I've seen this clue in The Telegraph.
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