As expected, currently drone is flying (2,6)
I believe the answer is:
no wonder
'as expected' is the definition.
(eg 'no wonder you're tired')
'currently drone is flying' is the wordplay.
'currently' becomes 'now' (right now).
'is flying' is an anagram indicator (letters fly around into new positions).
'drone' with letters rearranged gives 'onder'.
'now'+'onder'='NO WONDER'
(Other definitions for no wonder that I've seen before include "hardly unexpected" , "hardly unforeseen" , "it isn't surprising" .)