At this point, they're taking turns implying they're about to take action (4,4)
I believe the answer is:
here goes
'at this point they're taking turns implying they're about' is the definition.
The answer and definition are not the same part of speech.
'take action' is the wordplay.
'take' becomes 'here' (I've seen this in other clues).
'action' becomes 'goes' (I can't explain this - if you can you should give a lot more credence to this answer).
'here'+'goes'='HERE GOES!'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for here goes that I've seen before include "I'm about to start" , "Let's begin!" , "Gee horse (anag.)" , "Warning of impending action" , "Informally, I'm about to begin" .)