New promotion raised karate grade (3)
I believe the answer is:
dan
'karate grade' is the definition.
The definition suggests a singular noun which matches the answer.
'new promotion raised' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'promotion' becomes 'ad' (short for advert).
'raised' is a reversal indicator (going up in a down clue).
'n'+'ad'='nad'
'nad' reversed gives 'DAN'.
Can you help me to learn more?
(Other definitions for dan that I've seen before include "degree of proficiency in judo, say?" , "Karate expert" , "Grade of proficiency in judo" , "Level of competence in judo" , "Jacob's fourth son" .)