Titled Turk at home once more (5)
I believe the answer is:
again
'once more' is the definition.
(synonyms)
'titled turk at home' is the wordplay.
'titled turk' becomes 'aga' (I've seen this in another clue).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'aga'+'in'='AGAIN'
(Other definitions for again that I've seen before include "10 10 [AGAIN" , "Furthermore" , "Here we go ___" , "Ocne more" , "Repeatedly" .)