I belong unhappily in low birth (7)

I believe the answer is:

ignoble

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'low birth' is the definition.
'ignoble' can be an answer for 'low' (I've seen this in another clue). I'm not certain of the 'birth' bit.

'i belong unhappily' is the wordplay.
'unhappily' indicates an anagram.
'belong' with letters rearranged gives 'gnoble'.
'i'+'gnoble'='IGNOBLE'

'in' is the link.

Can you help me to learn more?

(Other definitions for ignoble that I've seen before include "No bilge! (anag)" , "'Dishonourable, mean (7)'" , "not in the top class" , "I belong to low sort" , "Not worthy in character or purpose" .)

I've seen this clue in The Sun.

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