Girl seeing bird, one in meadow (7)
I believe the answer is:
letitia
'girl' is the definition.
'bird one in meadow' is the wordplay.
'bird' becomes 'tit' (I've seen this before**).
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'meadow' becomes 'lea' (I've seen this before).
'tit'+'i'='titi'
'titi' going within 'lea' is 'LETITIA'.
'seeing' acts as a link.
(Other definitions for letitia that I've seen before include "Female" , "Girl" .)