Kestrel there flying round lake, confusedly (6-7)
I believe the answer is:
helter-skelter
'confusedly' is the definition.
(helter-skelter can mean in a confusing way)
'kestrel there flying round lake' is the wordplay.
'flying' indicates an anagram (letters fly around into new positions).
'round' is an insertion indicator.
'lake' becomes 'L' (geographical abbreviation).
'kestrel'+'there'='kestrelthere'
'kestrelthere' with letters rearranged gives 'heterskelter'.
'heterskelter' going around 'l' is 'HELTER-SKELTER'.
(Other definitions for helter-skelter that I've seen before include "Spiralling fairground ride" , "In disorderly haste" , "Slapdash - fairground ride" , "Fairground attraction" , "High spiral slide at fairground" .)