Move line in access of poetic inspiration (4)
I believe the answer is:
flit
'move' is the definition.
(flit is a kind of move)
'line in access of poetic inspiration' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' indicates putting letters inside.
'access of poetic inspiration' becomes 'fit' (I can't explain this - if you can you should give a lot more credence to this answer).
'l' going inside 'fit' is 'FLIT'.
Can you help me to learn more?
(Other definitions for flit that I've seen before include "Move house" , "Scurry lightly" , "Dart - elope" , "Move (like a moth)" , "Fly quickly (by moonlight?)" .)