Pay attention to heads of hospital emergency entrance divisions (4)

I believe the answer is:

heed

'pay attention to' is the definition.
(I've seen this before)

'heads of hospital emergency entrance divisions' is the wordplay.
'heads of' says to take the initial letters.
The first letters of 'hospital emergency entrance divisions' is 'HEED'.

(Other definitions for heed that I've seen before include "Listen to carefully" , "Take note of" , "Take to heart" , "Be mindful of" , "Caution" .)

I've seen this clue in the Sydney Morning Herald.

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