Stable men are upset by less rot (7)
I believe the answer is:
ostlers
'stable men' is the definition.
The definition and answer can be both people as well as being plural nouns.
Maybe there's a link between them I don't understand?
'upset by less rot' is the wordplay.
'upset by' is an anagram indicator.
'less'+'rot'='lessrot'
'lessrot' is an anagram of 'OSTLERS'.
'are' is the link.
Can you help me to learn more?
(Other definitions for ostlers that I've seen before include "Historically they looked after the horses at an inn" , "Let Ross join in group of old stable managers" , "Stablemen at inns of old" , "They used to stable horses at inns" , "They looked after the horses at the inns of old" .)