Pouch aboard airline guards regularly ignored (5)

I believe the answer is:

bursa

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'pouch' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'aboard airline guards regularly ignored' is the wordplay.
'aboard' is an insertion indicator.
'airline' becomes 'ba' (British Airways).
'regularly ignored' means one should take alternating letters.
The alternate letters of 'guards' are 'urs'.
'ba' enclosing 'urs' is 'BURSA'.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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