Make surgeon fall ill and have a perfect fit (8)
I believe the answer is:
dovetail
'have a perfect fit' is the definition.
(to dovetail is to fit perfectly)
'make surgeon fall ill' is the wordplay.
'make' becomes 'do' (do can mean to make or prepare).
'surgeon' becomes 'vet' (I've seen this in other clues).
'fall ill' becomes 'ail' (I've seen this in another clue).
'do'+'vet'+'ail'='DOVETAIL'
'and' acts as a link.
(Other definitions for dovetail that I've seen before include "Type of joint - fit closely together" , "Wood joint" , "Kind of joint" , "Ali voted (anag) - joint" , "Fit together well" .)