Sections must include a short lament for fliers (9)
I believe the answer is:
parakeets
'fliers' is the definition.
(parakeet is a kind of bird)
'sections must include a short lament' is the wordplay.
'sections' becomes 'parts' ('part' can be a synonym of 'section'**).
'must include' indicates putting letters inside.
'short' means to remove the last letter.
'lament' becomes 'keen' (keen is a kind of lament).
'keen' with its final letter taken off is 'kee'.
'a'+'kee'='akee'
'parts' going around 'akee' is 'PARAKEETS'.
'for' is the link.
(Other definitions for parakeets that I've seen before include "Birds" , "Peak rates (anag.)" .)