The bird has flown, you understand from her (7)
I believe the answer is:
bridget
'her' is the definition.
'the bird has flown you understand' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'bird' is 'brid' which is present in the answer.
'understand' could be 'get' (getting is a kind of understanding) and 'get' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'from' acts as a link.
Can you help me to learn more?
(Other definitions for bridget that I've seen before include "Saint" , "Girl" , "Saintly woman" , "Miss Jones the diarist" .)