Realist changed heraldic design (7)

I believe the answer is:

saltire

I'm a little stuck... Click here to teach me more about this clue!

'heraldic design' is the definition.
'saltire' can be an answer for 'design' (saltire is a kind of design). I'm unsure of the 'heraldic' bit.

'realist changed' is the wordplay.
'changed' is an anagram indicator.
'realist' anagrammed gives 'SALTIRE'.

Can you help me to learn more?

(Other definitions for saltire that I've seen before include "The Scottish flag" , "standard for Scots" , "Heraldic cross" , "Diagonal cross (heraldry)" , "flag - 8's? [SAINT ANDREW]" .)

I've seen this clue in The Sun.

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