Bejewelled ring is pale when lit by day (8)
I believe the answer is:
opalised
'pale when lit by day' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives can sometimes mean the same thing.
'bejewelled ring is' is the wordplay.
'bejewelled' becomes 'opaled' (I can't justify this - if you can you should give a lot more credence to this answer).
'ring' indicates putting letters inside.
'opaled' placed around 'is' is 'OPALISED'.
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