Crossword Genius

Cub: it is desperate for something to eat (7)

Ross

I believe the answer is:

biscuit

'something to eat' is the definition.
(biscuit is a kind of food)

'cub it is desperate' is the wordplay.
'desperate' is an anagram indicator.
'cub'+'it'+'is'='cubitis'
'cubitis' anagrammed gives 'BISCUIT'.

'for' is the link.

(Other definitions for biscuit that I've seen before include "Unglazed pottery" , "Small crisp cake" , "Eg, custard cream" , "Edible" , "Cookie - cracker" .)

I've seen this clue in The Times.
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