Fabulous bird, chicken, capturing duck in pictures (7)
I believe the answer is:
phoenix
'fabulous bird' is the definition.
(mythical or fabulous bird)
'chicken capturing duck in pictures' is the wordplay.
'chicken' becomes 'hen' (hen is a kind of chicken).
'capturing' indicates putting letters inside.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'in' is an insertion indicator.
'pictures' becomes 'pix' (short for pictures).
'hen' placed around 'o' is 'hoen'.
'hoen' put inside 'pix' is 'PHOENIX'.
(Other definitions for phoenix that I've seen before include "Mythological bird" , "Legendary bird said to emerge from the ashes of itself" , "Mythical bird rising from funeral pyre" , "Legendary Arabian bird" , "25 28 [MARS LANDER]" .)