Hotel make changes stopping Arabian in tracks (6)
I believe the answer is:
halter
'changes stopping arabian in tracks' is the definition.
I can't tell whether this definition defines the answer.
'hotel make' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'make' becomes 'alter' (I can't explain this - if you can you should give a lot more credence to this answer).
'h'+'alter'='HALTER'
Can you help me to learn more?
(Other definitions for halter that I've seen before include "Comparatively lame" , "Rope or leather strap for tying up horse" , "When there's harness" , "Dress strap round neck" , "Rope for leading animal" .)