Aesthetically pleasing model reversed in lorry (8)
I believe the answer is:
artistic
'aesthetically pleasing' is the definition.
(I've seen this before)
'model reversed in lorry' is the wordplay.
'model' becomes 'sit' ('sit' can be a synonym of 'model'**).
'reversed' is a reversal indicator.
'in' means one lot of letters goes inside another.
'lorry' becomes 'artic' (articulated lorry is a semi-trailer truck).
'sit' reversed gives 'tis'.
'tis' put inside 'artic' is 'ARTISTIC'.
(Other definitions for artistic that I've seen before include "Having creative gifts" , "(Musical) work" , "Having creative skills" , "I stir cat (anag.)" , "cultivated" .)