But, in New York, it's one plus ten, maybe! (6)
I believe the answer is:
ninety
'but in new york it's one plus ten maybe' is the definition.
I can't tell whether this definition defines the answer.
'in new york it's one plus ten maybe' is the wordplay.
'in' is an insertion indicator.
'new york' becomes 'ny'.
'it's one' becomes 'i' (Roman numeral).
'plus' is a charade indicator (letters next to each other).
'maybe' indicates an anagram.
'i'+'ten'='iten'
'iten' is an anagram of 'inet'.
'ny' placed around 'inet' is 'NINETY'.
Can you help me to learn more?
(Other definitions for ninety that I've seen before include "Minutes in a soccer game" , "fair amount" , "quite an age" , "''Oh, the craic was ... in the Isle of Man'' (The Dubliners)" , "old age" .)