Serves nun so badly due to feeling of trepidation (11)

I believe the answer is:

nervousness

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'feeling of trepidation' is the definition.
'nervousness' can be an answer for 'trepidation' (thesaurus). I'm not sure about the 'feeling of' bit.

'serves nun so badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'serves'+'nun'+'so'='servesnunso'
'servesnunso' is an anagram of 'NERVOUSNESS'.

'due to' acts as a link.

Can you help me to learn more?

(Other definitions for nervousness that I've seen before include "Disquiet" , "Anxiety, apprehension" .)

I've seen this clue in The Irish Times.

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