Brought up familiar air believed to have been written about wild rose (5)
I believe the answer is:
briar
'wild rose' is the definition.
(I've seen this before)
'brought up familiar air believed to have' is the wordplay.
'brought up' says the letters should be written backwards (in a down clue, letters go up).
'to have' says the answer is hidden in the clue.
'rairb' can be found hidden inside 'familiar air believed'.
'rairb' backwards is 'BRIAR'.
'been written about' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for briar that I've seen before include "Wild rose bush" , "that one may smoke" , "Prickly wooden stem" , "Prickly scrambling shrub" , "Tobacco pipe" .)