Crossword Genius

Pro said grass is blue? (7)

Ross

I believe the answer is:

forlorn

I'm a little stuck... Click here to teach me more about this clue!

'grass is blue?' is the definition.
I can't tell whether this defines the answer.

'pro said' is the wordplay.
'pro' becomes 'for' (I've seen this before).
'said' becomes 'lorn' (I can't explain this - if you can you should believe this answer much more).
'for'+'lorn'='FORLORN'

Can you help me to learn more?

(Other definitions for forlorn that I've seen before include "Forsaken" , "Wretched" , "Miserable" , "Pitifully sad and lonely" , "Left alone and unhappy" .)

I've seen this clue in the Sydney Morning Herald.
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