Jockeys perhaps wheeze at the end of races (5)
I believe the answer is:
pants
'jockeys' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how they can define each other.
'wheeze at the end of races' is the wordplay.
'wheeze' becomes 'pant' (I've seen this in another clue).
'at the end of' indicates one should take the final letters.
The final letter of 'races' is 's'.
'pant'+'s'='PANTS'
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for pants that I've seen before include "See 17" , "Briefs" , "less than desirable" , "Useless (slang) - gasps" , "clothing" .)