Oh! I used to be shaped like Quasimodo! (7)

I believe the answer is:

hideous

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'shaped like quasimodo' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can sometimes define each other.

'oh i used to be' is the wordplay.
'to be' indicates anagramming the letters.
'oh'+'i'+'used'='ohiused'
'ohiused' is an anagram of 'HIDEOUS'.

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(Other definitions for hideous that I've seen before include "revolting" , "Extremely unpleasant" , "Frightful" , "Repulsive" , "Horrible" .)

I've seen this clue in The Sun.

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