Difficult lesson about extreme risk of breathing tubes (8)
I believe the answer is:
snorkels
'breathing tubes' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?
'difficult lesson about extreme risk' is the wordplay.
'difficult' indicates anagramming the letters.
'about' is an insertion indicator.
'extreme' suggests removing the centre.
'risk' with its middle removed is 'rk'.
'lesson' is an anagram of 'snoels'.
'snoels' going around 'rk' is 'SNORKELS'.
'of' is the link.
Can you help me to learn more?
(Another definition for snorkels that I've seen is " Breathing devices for swimmers".)