Doctor White on TV lost face (5)
I believe the answer is:
alter
'doctor' is the definition.
(I've seen this in another clue)
'white on tv lost face' is the wordplay.
I cannot quite see how this works, but
'lost' could be 'l' (abbreviation in sporting league tables) and 'l' is located in the answer.
'on' could be 'at' (I've seen this in other clues) and 'at' is found within the remaining letters.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for alter that I've seen before include "Alert to change" , "Revise" , "and 10 Across: Second self" , "Change or adjust" , "convert" .)