He has skill in one kind of surgery (5)
I believe the answer is:
heart
'one kind of surgery' is the definition.
'heart' can be an answer for 'surgery' (thesaurus). I'm not certain of the 'one kind of' bit.
'he has skill' is the wordplay.
'has' means one lot of letters go next to another.
'skill' becomes 'art' (both can mean a talent).
'he'+'art'='HEART'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for heart that I've seen before include "Centre; core" , "Spirit - core" , "See 22" , "bottle" , "Blood-pumping organ" .)