"Specialist training" refers to a focused and targeted form of education or learning. It allows individuals to gain expertise and advanced knowledge in a specific area or field of study. Full definition
Teachers will need to be provided with specialist training in democratic education. (hundred.org)
Cognitive therapy was based on a specific cognitive module with an associated manual and delivered by therapists with specialist training who received regular supervision. (ebmh.bmj.com)
Business and specialist training courses are often available from employers. (cvtips.com)