Crossword Genius

Was an informer like a lawn? (7)

Ross

I believe the answer is:

grassed

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

'was an' is the definition.
I can't judge whether this defines the answer.

'informer like a lawn?' is the wordplay.
'informer' becomes 'grass' (grass can mean an informant).
'like a lawn?' becomes 'ed' (I can't justify this - if you can you should believe this answer much more).
'grass'+'ed'='GRASSED'

Can you help me to learn more?

(Other definitions for grassed that I've seen before include "Gave away information" , "catch thus dropped" , "Turfed - informed" , "green?" , "Snitched, shopped" .)

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