Momentarily run away from a prickling sensation (10)
I believe the answer is:
fleetingly
'momentarily' is the definition.
(I've seen this before)
'run away from a prickling sensation' is the wordplay.
'run away from' becomes 'flee' (I've seen this in another clue).
'a prickling sensation' becomes 'tingly' (I can't explain this - if you can you should believe this answer much more).
'flee'+'tingly'='FLEETINGLY'
Can you help me to learn more?
(Other definitions for fleetingly that I've seen before include "for a short time" , "for a brief moment" , "momentarily" .)