A poetic pattern in progress (5)
I believe the answer is:
afoot
'in progress' is the definition.
(I've seen this before)
'a poetic pattern' is the wordplay.
'poetic pattern' becomes 'foot' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'foot'='AFOOT'
Can you help me to learn more?
(Other definitions for afoot that I've seen before include "Going on" , "Under way (like hunted game?)" , "Brewing" , "Astir" , "In the pipeline" .)