It’s regrettable about your escalating wage (6)
I believe the answer is:
salary
'wage' is the definition.
(synonyms)
'it's regrettable about your' is the wordplay.
'it's regrettable' becomes 'sala' (I am not sure about this - if you are sure you should believe this answer much more).
'about' says the letters should be written backwards.
'your' becomes 'yr' (shortened version of 'your' in eg textspeak).
'yr' back-to-front is 'ry'.
'sala'+'ry'='SALARY'
'escalating' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for salary that I've seen before include "Remuneration, earnings" , "Remuneration for Ray and Sal" , "Regular remuneration" , "Worker's pay" , "(Employee's) pay" .)