Informal pictures, that is, of a fairy (5)

I believe the answer is:

pixie

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'a fairy' is the definition.
(I know that pixie is a type of fairy)

'informal pictures that is' is the wordplay.
'informal pictures' becomes 'pix' (short for pictures. I am not sure about the 'informal' bit.).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'pix'+'ie'='PIXIE'

'of' is the link.

Can you help me to learn more?

(Other definitions for pixie that I've seen before include "Mischievous fairy" , "Elfin fairy" , "Small human-like supernatural being" , "Elf, imp" , "Sprite" .)

I've seen this clue in the Evening Standard.

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