Chum regularly improvised music outside with me in hot tub (7)
I believe the answer is:
jacuzzi
'hot tub' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'chum regularly improvised music outside with me' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'improvised music' becomes 'jazz' (I've seen this before).
'outside' indicates putting letters inside.
'with' is a charade indicator (letters next to each other).
'me' becomes 'i'.
The alternate letters of 'chum' are 'cu'.
'cu' put within 'jazz' is 'jacuzz'.
'jacuzz'+'i'='JACUZZI'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for jacuzzi that I've seen before include "Modern bath with underwater jets" , "Whirlpool bathtub with underwater jets" , "Bath with water jets" , "Bath in which water is mechanically agitated" , "Whirly bath" .)