Trained master and trained worker (9)
I believe the answer is:
tradesman
'trained worker' is the definition.
'tradesman' can be an answer for 'worker' (I have seen 'Skilled worker ' mean 'tradesman' so perhaps 'worker' could also mean 'tradesman'). I am unsure of the 'trained' bit.
'trained master and' is the wordplay.
'trained' is an anagram indicator (to train can mean to grow something into a shape).
'master'+'and'='masterand'
'masterand' anagrammed gives 'TRADESMAN'.
Can you help me to learn more?
(Other definitions for tradesman that I've seen before include "Shopkeeper; skilled mechanic" , "Business operator" , "One buying and selling" , "Skilled hand" , "Skilled worker; shopkeeper" .)