Crossword Genius

Come on, it's fantastic how they picture your feelings (9)

Ross

I believe the answer is:

emoticons

'they picture your feelings' is the definition.
(images which represent emotions)

'come on it's fantastic' is the wordplay.
'fantastic' indicates an anagram.
'come'+'on'+'its'='comeonits'
'comeonits' anagrammed gives 'EMOTICONS'.

'how' acts as a link.

(Other definitions for emoticons that I've seen before include "symbols" , "facial expressions" .)

I've seen this clue in The Guardian.
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