One British politician promises to pay, which seems disrespectful (7)
I believe the answer is:
impious
'disrespectful' is the definition.
(similar in meaning)
'one british politician promises to pay' is the wordplay.
'one' becomes 'i' (Roman numeral).
'british politician' becomes 'MP' (Member of Parliament).
'promises to pay' becomes 'IOU's' (promises to pay a debt).
'i'+'mp'+'ious'='IMPIOUS'
'which seems' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for impious that I've seen before include "Irreverent; wicked" , "Lacking veneration or respect" , "Ungodly" , "Showing disrespect for a god" , "Wicked, profane" .)