Exotic siren handy for checking the horses (5)
I believe the answer is:
reins
'handy for checking the horses' is the definition.
I can't judge whether this defines the answer.
'exotic siren' is the wordplay.
'exotic' indicates anagramming the letters (an unusual form of the letters).
'siren' anagrammed gives 'REINS'.
Can you help me to learn more?
(Other definitions for reins that I've seen before include "Rider's straps" , "Checks" , "Straps to control" , "Horse's controls" , "Guiding straps" .)