More upset about an individual complaining (6)

I believe the answer is:

moaner

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

'individual complaining' is the definition.
I can't tell whether this defines the answer.

'more upset about an' is the wordplay.
'upset' is an anagram indicator.
'about' means one lot of letters goes inside another.
'more' anagrammed gives 'moer'.
'moer' placed around 'an' is 'MOANER'.

Can you help me to learn more?

(Other definitions for moaner that I've seen before include "One who complains" , "Complainer" , "Grouch" , "Grumbler" .)

I've seen this clue in The Irish Independent.

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