Mr Bloggs introducing the start of your free pleasure trip (7)
I believe the answer is:
joyride
'pleasure trip' is the definition.
(enjoyable ride in a vehicle)
'mr bloggs introducing the start of your free' is the wordplay.
'mr bloggs' becomes 'Joe' (as in Joe Bloggs, term for an average man).
'introducing' indicates putting letters inside (some letters introduced or inserted into others).
'the start of' says to take the initial letters.
'free' becomes 'rid' (to be free of something is to be rid of it).
The initial letter of 'your' is 'y'.
'y'+'rid'='yrid'
'joe' going around 'yrid' is 'JOYRIDE'.
(Other definitions for joyride that I've seen before include "Drive by thieves" , "take sleigh without permission?" .)