London icon close to Shard omitted in pictorial representation (5)
I believe the answer is:
rebus
'pictorial representation' is the definition.
(type of visual puzzle)
I can't explain the remainder of the clue.
(Other definitions for rebus that I've seen before include "Word-picture puzzle" , "Picture-letter puzzle" , "Ian Rankin's Scottish detective" , "Visual wordplay - Rankin's inspector" , "Pictorial wordplay" .)