The Sun reported charge on public transport (7)
I believe the answer is:
phoebus
'the sun' is the definition.
(I've seen this before)
'reported charge on public transport' is the wordplay.
'reported charge on' becomes 'phoe' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'public transport' becomes 'bus' (bus is a kind of public transport).
'phoe'+'bus'='PHOEBUS'
Can you help me to learn more?
(Other definitions for phoebus that I've seen before include "Greek sun god" , "Forename of Apollo" .)