Bird's back in Sun a lot, routinely (7)
I believe the answer is:
ortolan
'bird's' is the definition.
(ortolan is a kind of bird)
'back in sun a lot routinely' is the wordplay.
'back' says the letters should be written in reverse.
'in' says the answer is hidden in the clue.
'nalotro' can be found hidden inside 'sun a lot routinely'.
'nalotro' back-to-front is 'ORTOLAN'.
(Other definitions for ortolan that I've seen before include "Flier" , "high-flying singer" , "Bird" , "One flying" , "European bunting" .)