Crossword Genius

Stomach has a medium length (5)

Ross

I believe the answer is:

gamut

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

'length' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

'stomach has a medium' is the wordplay.
'stomach' becomes 'gut' (I've seen this before).
'has' means one lot of letters goes inside another.
'medium' becomes 'm' (as in UK clothing sizes).
'a'+'m'='am'
'gut' going around 'am' is 'GAMUT'.

Can you help me to learn more?

(Other definitions for gamut that I've seen before include "Ambit" , "The whole range or scope of anything" , "Full (emotional) range" , "Entire range" , "Whole range (from A to Z)" .)

I've seen this clue in The Mirror.
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