Crossword Genius

A cub - it is playing with a fawn (7)

Ross

I believe the answer is:

biscuit

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

'a fawn' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'a cub it is playing' is the wordplay.
'it is' becomes 'itis'.
'playing' indicates anagramming the letters.
'cub'+'itis'='cubitis'
'cubitis' is an anagram of 'BISCUIT'.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for biscuit that I've seen before include "Eg, ginger nut" , "Unglazed pottery" , "Eg, custard cream" , "Baked item; light brown" , "Custard cream, perhaps" .)

I've seen this clue in the Evening Standard.
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