Cross sailor gets over anger (7)

I believe the answer is:

saltire

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

'cross' is the definition.
(I know that saltire is a type of cross)

'sailor gets over anger' is the wordplay.
'sailor' becomes 'salt' (salt is a kind of sailor).
'gets' means one lot of letters go next to another.
'over anger' becomes 'ire' (ire is intense rage. I am not sure about the 'over' bit.).
'salt'+'ire'='SALTIRE'

Can you help me to learn more?

(Other definitions for saltire that I've seen before include "Cross like St Andrew's" , "X-shaped cross" , "The Scottish flag" , "standard for Scots" , "Heraldic cross" .)

I've seen this clue in The Globe and Mail, The Telegraph and The Guardian.

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