Fate indicated by doctor having troubled air (5)
I believe the answer is:
moira
'fate' is the definition.
(thesaurus)
'doctor having troubled air' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'having' says to put letters next to each other.
'troubled' is an anagram indicator.
'air' with letters rearranged gives 'ira'.
'mo'+'ira'='MOIRA'
'indicated by' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for moira that I've seen before include "-- Shearer, ballet dancer" , "Shearer, possibly" , "Any of the three Greek Fates" , "- - Shearer, actress-ballerina" , "Girl" .)