Grass over comely Cambridge Backs (3)

I believe the answer is:

rye

'grass' is the definition.
(I've seen this before)

'over comely cambridge backs' is the wordplay.
'backs' suggests the final letters (I've seen 'back' mean this).
The final letters of 'over comely cambridge' are 'RYE'.

(Other definitions for rye that I've seen before include "Grain crop" , "21 [GRASS]" , "Whisky; Sussex town" , "A Cinque Port; a grain" , "Grass - whiskey" .)

I've seen this clue in The Sun.

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