Throw my shilling up, making representation (6)
I believe the answer is:
symbol
'representation' is the definition.
(I've seen this in another clue)
'throw my shilling up' is the wordplay.
'throw' becomes 'lob' (to lob something is to chuck or throw it).
'shilling' becomes 's' (abbreviation e.g. Lsd - pounds, shillings, pence).
'up' is a reversal indicator (in down clue: letters go upwards).
'lob'+'my'+'s'='lobmys'
'lobmys' written backwards gives 'SYMBOL'.
'making' is the link.
(Other definitions for symbol that I've seen before include "Representation, token" , "Badge" , "Emblem, icon" , "Something representative" , "Something that stands for something else" .)