Skilled worker and master in rebuilding (9)
I believe the answer is:
tradesman
'skilled worker' is the definition.
(I know that tradesman is a type of skilled worker)
'and master in rebuilding' is the wordplay.
'in rebuilding' indicates anagramming the letters (I've seen this in other clues).
'and'+'master'='andmaster'
'andmaster' anagrammed gives 'TRADESMAN'.
(Other definitions for tradesman that I've seen before include "Skilled hand" , "Skilled worker; shopkeeper" , "One buying and selling" , "Small-scale businessman" , "Shopkeeper; skilled mechanic" .)