Complicated matter without money for a special celebration (5)

I believe the answer is:

treat

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'special celebration' is the definition.
'treat' can be an answer for 'celebration' (I've seen this before). I am not certain of the 'special' bit.

'complicated matter without money' is the wordplay.
'complicated' indicates anagramming the letters (a complex or confusing ordering of the letters).
'without' is a deletion indicator.
'money' becomes 'm' (abbreviation used in economics).
'matter' with 'm' removed is 'atter'.
'atter' is an anagram of 'TREAT'.

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for treat that I've seen before include "Act toward or regard in a certain way" , "Minister - buy one a drink" , "Tetra (anag.)" , "Source of gratification" , "Stand a drink" .)

I've seen this clue in The Guardian.

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