Short let written about in flier (8)
I believe the answer is:
throstle
'flier' is the definition.
(kind of bird)
'short let written about' is the wordplay.
'written about' is an anagram indicator (letters moved about before being rewritten).
'short'+'let'='shortlet'
'shortlet' is an anagram of 'THROSTLE'.
'in' is the link.
(Other definitions for throstle that I've seen before include "Bird - short let (anag)" , "Young thrush" , "Song thrush -- short let (anag)" , "Mavis" , "birdie" .)