Small bird hurried to good heather (9)
I believe the answer is:
fledgling
'small bird' is the definition.
'fledgling' can be an answer for 'bird' (I have seen 'Young bird ' mean 'fledgling' so perhaps 'bird' could also mean 'fledgling'). I'm unsure of the 'small' bit.
'hurried to good heather' is the wordplay.
'hurried' becomes 'fled' (I can't justify this - if you can you should believe this answer much more).
'to good' becomes 'g' (abbreviation).
'heather' becomes 'ling' (synonyms).
'fled'+'g'+'ling'='FLEDGLING'
Can you help me to learn more?
(Other definitions for fledgling that I've seen before include "Young one in flight" , "Young bird" , "Trainee" .)