Crossword Genius

Breathe irregularly at what should be regular (9)

Ross

I believe the answer is:

heartbeat

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'should be regular' is the definition.
I can't judge whether this definition defines the answer.

'breathe irregularly at' is the wordplay.
'irregularly' is an anagram indicator.
'breathe' is an anagram of 'heartbe'.
'heartbe'+'at'='HEARTBEAT'

'what' acts as a link.

Can you help me to learn more?

(Other definitions for heartbeat that I've seen before include "Essential pulsation" , "Circulation noise" , "Pulse of cardiac origin" , "Animating force" .)

I've seen this clue in The Guardian and The Globe and Mail.
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