He'll be out of place in bar seat (9)

I believe the answer is:

abstainer

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'he'll' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'out of place in bar seat' is the wordplay.
'out of place' indicates an anagram.
'in'+'bar'+'seat'='inbarseat'
'inbarseat' is an anagram of 'ABSTAINER'.

'be' is the link.

Can you help me to learn more?

(Other definitions for abstainer that I've seen before include "Bull's not my stuff" , "Rechabite" , "Teetotaller" , "One declining to vote" , "AA member" .)

I've seen this clue in The Globe and Mail.

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