With frequency not satisfactory in intro, more piano (5)
I believe the answer is:
often
'with frequency' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for often that I've seen before include "More than occasionally" , "Perhaps daily" , "Frequently, not seldom" , "Regularly" , "on numerous occasions" .)