Everybody in disorganised side plays triflingly (7)

I believe the answer is:

dallies

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'plays triflingly' is the definition.
I can't judge whether this defines the answer.

'everybody in disorganised side' is the wordplay.
'everybody' becomes 'all' (I've seen this before).
'in' means one lot of letters goes inside another.
'disorganised' is an anagram indicator.
'side' with letters rearranged gives 'dies'.
'all' placed inside 'dies' is 'DALLIES'.

Can you help me to learn more?

(Another definition for dallies that I've seen is " wastes time".)

I've seen this clue in The Irish Independent.

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