Attitude of one male in small clinical speciality twice (9)
I believe the answer is:
sentiment
'attitude' is the definition.
(thesaurus)
'one male in small clinical speciality twice' is the wordplay.
'one male' becomes 'im' (I can't explain this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'clinical speciality' becomes 'ENT' (Ear, Nose and Throat department in a hospital).
'twice' shows that letters should be duplicated.
'ent' doubled is 'entent'.
's'+'entent'='sentent'
'im' inserted within 'sentent' is 'SENTIMENT'.
'of' is the link.
(Other definitions for sentiment that I've seen before include "Emotional feeling" , "Emotion, self-indulgent or insincere perhaps" , "View, opinion, feeling" , "Emotional thought" , "Tender or romantic emotion" .)