Crossword Genius

Roguish letters to a politician (5)

Ross

I believe the answer is:

scamp

I'm a little stuck... Click here to teach me more about this clue!

'politician' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'roguish letters to a' is the wordplay.
'roguish letters' becomes 'sc' (I can't justify this - if you can you should believe this answer much more).
'to a' becomes 'amp' (A is the symbol for the amp or ampere).
'sc'+'amp'='SCAMP'

Can you help me to learn more?

(Other definitions for scamp that I've seen before include "little monkey" , "Mischievous child (colloq.)" , "Little Devil" , "Scallywag" , "Impish youngster" .)

I've seen this clue in the Evening Standard.
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