Conservative, as originally recorded, boarding boat, being averse to road transport (7)
I believe the answer is:
carsick
'averse to road transport' is the definition.
I can't judge whether this definition defines the answer.
'conservative as originally recorded boarding boat' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'originally' says to take the initial letters.
'boarding' is an insertion indicator.
'boat' becomes 'ick' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The initial letter of 'recorded' is 'r'.
'as' placed around 'r' is 'ars'.
'c'+'ars'+'ick'='CARSICK'
'being' is the link.
Can you help me to learn more?
(Other definitions for carsick that I've seen before include "Suffering from vehicle motion" , "Experiencing nausea when being driven" .)