More paintings by Emin initially put up (5)
I believe the answer is:
extra
'more' is the definition.
(I've seen this in another clue)
'paintings by emin initially put up' is the wordplay.
'paintings' becomes 'art' (painting is a type of artwork).
'by' becomes 'x' (2 by 4 is 2 x 4).
'initially' indicates taking the first letters.
'put up' says the letters should be written backwards.
The first letter of 'emin' is 'e'.
'art'+'x'+'e'='artxe'
'artxe' written backwards gives 'EXTRA'.
(Other definitions for extra that I've seen before include "leg bye perhaps" , "Especially" , "Something additional or bit player in movie" , "not included" , "Superfluous" .)