'Trajan', Glyndebourne somewhat discordant (6)

I believe the answer is:

jangly

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

'discordant' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'trajan glyndebourne somewhat' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'JANGLY' is hidden within 'trajan glyndebourne'.

Can you help me to learn more?

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app