Top performer develops random pain (5,5)

I believe the answer is:

prima donna

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

'top performer' is the definition.
'prima donna' can be an answer for 'performer' (prima donna is a kind of performer). I'm not sure about the 'top' bit.

'develops random pain' is the wordplay.
'develops' indicates anagramming the letters.
'random'+'pain'='randompain'
'randompain' anagrammed gives 'PRIMA DONNA'.

Can you help me to learn more?

(Other definitions for prima donna that I've seen before include "Top female singer" , "Leading lady, proverbially temperamental" , "Female opera star" , "a right madam?" , "opera star - with 2d" .)

I've seen this clue in The Irish Times.

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