Crossword Genius

Keep withholding answer - it's an inflammation (9)

Ross

I believe the answer is:

retinitis

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

'inflammation' is the definition.
(I know that retinitis is a type of inflammation)

'keep withholding answer it's an' is the wordplay.
I cannot really understand how this works, but
'it's' could be 'tis' (I've seen this before) and 'tis' is found within the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Daily Express.
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