Foolishly remonstrating while being ejected from this tram for tunes played on mobile phone (9)
I believe the answer is:
ringtones
'foolishly remonstrating while being ejected from this tram for tunes played' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'on mobile phone' is the wordplay.
'on' says to put letters next to each other.
'mobile' becomes 'tones' (I can't justify this - if you can you should give a lot more credence to this answer).
'phone' becomes 'ring' (to ring on the phone).
'tones' put after 'ring' is 'RINGTONES'.
Can you help me to learn more?
(Another definition for ringtones that I've seen is " phone numbers?".)