Attractive motor, no boot, silver interior: £1,000 (8)
I believe the answer is:
engaging
'attractive' is the definition.
(similar in meaning)
'silver interior ps1000' is the wordplay.
'silver' becomes 'argentic' (I've seen this in another clue).
'interior' means to look at the middle letters.
'psg000' becomes 'gaging' (I can't justify this - if you can you should give a lot more credence to this answer).
The centre of 'argentic' is 'en'.
'en'+'gaging'='ENGAGING'
'motor no boot' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
(Other definitions for engaging that I've seen before include "lt's attractive" , "Beginning military action" , "Delightful; promising" , "Taking into employment" , "coming into battle" .)