Crossword Genius

Out of sorts after rum truffle (7)

Ross

I believe the answer is:

fretful

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'out of sorts' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'rum truffle' is the wordplay.
'rum' is an anagram indicator (rum can mean strange or unusual).
'truffle' is an anagram of 'FRETFUL'.

'after' acts as a link.

Can you help me to learn more?

(Other definitions for fretful that I've seen before include "Peevish" , "Anxious" , "Querulous" , "on edge" , "Unsettled, irritated" .)

I've seen this clue in the Sydney Morning Herald.
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