Commitment to promotion in this place not even niche (9)
I believe the answer is:
adherence
'commitment' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
'promotion in this place not even niche' is the wordplay.
'promotion' becomes 'ad' (short for advert).
'in this place' becomes 'here' (synonyms).
'not even' indicates alternate letters (remove even-numbered letters).
The alternating letters of 'niche' are 'nce'.
'ad'+'here'+'nce'='ADHERENCE'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for adherence that I've seen before include "Sticking together" , "devotion" , "loyalty" .)