Crossword Genius

Grumble a great deal, but not entirely cross (7)

Ross

I believe the answer is:

beefalo

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

'grumble a great deal but not entirely' is the wordplay.
'grumble' becomes 'beef' (I've seen this before).
'great deal' becomes 'lot' (I've seen this before).
'but not entirely' means to remove the last letter.
'lot' with its last letter removed is 'lo'.
'beef'+'a'+'lo'='BEEFALO'

(Another definition for beefalo that I've seen is " Cross".)

I've seen this clue in The Telegraph.
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