Dull article in Paris Match about leaving Tours (10)

'dull' is the definition.
(I know that dull can be written as unexciting)

'article in paris match about leaving tours' is the wordplay.
'article in paris' becomes 'un' (indefinite article in French).
'match about' becomes 'c' (I can't explain this - if you can you should give a lot more credence to this answer).
'leaving' becomes 'exiting' (to exit is to leave).
'tours' means one lot of letters goes inside another (tour can mean to go around).
'c' put into 'exiting' is 'exciting'.
'un'+'exciting'='UNEXCITING'

Can you help me to learn more?