Devotee having a look in New York City? (7)
I believe the answer is:
buffalo
'in new york city?' is the definition.
(I've seen this before)
'devotee having a look' is the wordplay.
'devotee' becomes 'buff' (synonyms).
'having' means one lot of letters go next to another.
'look' becomes 'lo' (archaic exclamation meaning 'look!').
'buff'+'a'+'lo'='BUFFALO'
(Other definitions for buffalo that I've seen before include "Horny beast" , "Large wild ox" , "creature" , "Colloquialism for the N American bison" , "Wild ox - New York city" .)