Showing Dianas taking a dramatic part (10)

I believe the answer is:

displaying

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

'showing' is the definition.
('display' can be a synonym of 'show')

'dianas taking a dramatic part' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
'part' could be 'in' (synonyms) and 'in' is present 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 Irish News.

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