Horse riding in Times Square, strangely (13)
I believe the answer is:
equestrianism
'horse riding' is the definition.
(I've seen this before)
'in times square strangely' is the wordplay.
'strangely' indicates an anagram.
'in'+'times'+'square'='intimessquare'
'intimessquare' is an anagram of 'EQUESTRIANISM'.
(Other definitions for equestrianism that I've seen before include "Horse-riding" , "Sport of horse riding" , "Skill of horse riding" , "Horsemanship" .)