Not upset, by and large, dropping Barney (4)

I believe the answer is:

glad

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'not upset by and large dropping barney' is the definition.
I can't tell whether this definition defines the answer.

'upset by and large dropping barney' is the wordplay.
'upset' indicates anagramming the letters.
'dropping' indicates named letters should be taken away.
'by'+'and'+'large'='byandlarge'
'byandlarge' with 'barney' removed is 'dlag'.
'dlag' is an anagram of 'GLAD'.

Can you help me to learn more?

(Other definitions for glad that I've seen before include "Not sorry" , "Made up" , "Feeling happy" , "bright?" , "Little flowering plant" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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