Crossword Genius

Belt tune out — an aid to digestion! (5,3)

Ross

I believe the answer is:

betel nut

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

'aid to digestion' is the definition.
I can't judge whether this definition defines the answer.

'belt tune out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'belt'+'tune'='belttune'
'belttune' is an anagram of 'BETEL-NUT'.

'an' is the link.

Can you help me to learn more?

(Other definitions for betel nut that I've seen before include "stimulant" , "that's found on palm" , "supplies a narcotic" , "Seed of a palm chewed (with its leaves) as a narcotic" .)

I've seen this clue in The Times.
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