Re-enlist disheartened rookie throwing back orange juice at home (6)
I believe the answer is:
rejoin
're-enlist disheartened rookie throwing back orange juice at home' is the definition.
I can't judge whether this defines the answer.
'disheartened rookie throwing back orange juice at home' is the wordplay.
'disheartened' suggests removing the centre (the middle or heart is removed).
'throwing back' says the letters should be written backwards.
'orange juice' becomes 'oj' (abbreviation).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'rookie' with its middle removed is 're'.
'oj' reversed gives 'jo'.
're'+'jo'+'in'='REJOIN'
Can you help me to learn more?
(Other definitions for rejoin that I've seen before include "Unite again" , "Become a member again" , "Return" , "counter" , "Sign up again" .)