Convert in denial? Terrible! (5)

I believe the answer is:

alter

'convert' is the definition.
(I know that convert is a more specific form of the action alter)

'in denial? terrible' is the wordplay.
'in' indicates a hidden word.
'ALTER' is hidden within 'denial terrible'.

(Other definitions for alter that I've seen before include "and 10 Across: Second self" , "Metamorphose" , "Make changes to" , "Bout of extravagant spending" , "Alert to change" .)

I've seen this clue in The Daily Express.

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