Artwork could make attendant blush, were I to go in (11)
I believe the answer is:
watercolour
'go in' is the definition.
The definition suggests an adjective which matches the answer.
'artwork could make attendant blush were i' is the wordplay.
I cannot really see how this works, but
'blush' could be 'colour' (I've seen this before) and 'colour' is found within the answer.
'i' could be 'a' and 'a' is located in the answer.
This explanation may well be incorrect...
'to' acts as a link.
(Other definitions for watercolour that I've seen before include "Type of painting" , "Painted picture" .)